diff --git a/src/utils/__tests__/requestOptimizer.spec.ts b/src/utils/__tests__/requestOptimizer.spec.ts
new file mode 100644
index 00000000..f47e0f4e
--- /dev/null
+++ b/src/utils/__tests__/requestOptimizer.spec.ts
@@ -0,0 +1,149 @@
+import {
+  abortAllRequests,
+  getActiveRequestsCount,
+  initializeRequestOptimizer,
+  setNavigatingState,
+} from '@/utils/requestOptimizer'
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
+
+interface RequestConfigFake {
+  signal?: AbortSignal
+}
+
+interface ResponseFake {
+  config?: RequestConfigFake
+  data?: unknown
+}
+
+interface RequestErrorFake {
+  config?: RequestConfigFake
+  message: string
+}
+
+type RejectedInterceptor = (error: unknown) => Promise<never>
+
+/** 捕获 Axios 注册的 interceptor，以真实调用顺序驱动请求生命周期。 */
+function createAxiosInterceptorFake() {
+  let requestFulfilled: ((config: RequestConfigFake) => RequestConfigFake) | undefined
+  let requestRejected: RejectedInterceptor | undefined
+  let responseFulfilled: ((response: ResponseFake) => ResponseFake) | undefined
+  let responseRejected: RejectedInterceptor | undefined
+
+  const requestUse = vi.fn(
+    (fulfilled: (config: RequestConfigFake) => RequestConfigFake, rejected: RejectedInterceptor) => {
+      requestFulfilled = fulfilled
+      requestRejected = rejected
+      return 0
+    },
+  )
+  const responseUse = vi.fn((fulfilled: (response: ResponseFake) => ResponseFake, rejected: RejectedInterceptor) => {
+    responseFulfilled = fulfilled
+    responseRejected = rejected
+    return 0
+  })
+  const axiosInstance = {
+    interceptors: {
+      request: { use: requestUse },
+      response: { use: responseUse },
+    },
+  }
+
+  initializeRequestOptimizer(axiosInstance)
+
+  return {
+    request: {
+      fulfilled: requestFulfilled!,
+      rejected: requestRejected!,
+    },
+    requestUse,
+    response: {
+      fulfilled: responseFulfilled!,
+      rejected: responseRejected!,
+    },
+    responseUse,
+  }
+}
+
+describe('requestOptimizer', () => {
+  beforeEach(() => {
+    abortAllRequests()
+    setNavigatingState(false)
+    vi.spyOn(console, 'log').mockImplementation(() => {})
+  })
+
+  afterEach(() => {
+    abortAllRequests()
+    setNavigatingState(false)
+    vi.restoreAllMocks()
+  })
+
+  it('为没有 signal 的请求注入控制器，并在正常响应后清理', () => {
+    const interceptors = createAxiosInterceptorFake()
+    const config = interceptors.request.fulfilled({})
+
+    expect(interceptors.requestUse).toHaveBeenCalledOnce()
+    expect(interceptors.responseUse).toHaveBeenCalledOnce()
+    expect(config.signal).toBeInstanceOf(AbortSignal)
+    expect(config.signal?.aborted).toBe(false)
+    expect(getActiveRequestsCount()).toBe(1)
+
+    const response = { config, data: { ok: true } }
+    expect(interceptors.response.fulfilled(response)).toBe(response)
+    expect(getActiveRequestsCount()).toBe(0)
+  })
+
+  it('在错误响应后清理控制器，并保留原始拒绝原因', async () => {
+    const interceptors = createAxiosInterceptorFake()
+    const config = interceptors.request.fulfilled({})
+    const responseError: RequestErrorFake = { config, message: 'request failed' }
+
+    await expect(interceptors.response.rejected(responseError)).rejects.toBe(responseError)
+    expect(getActiveRequestsCount()).toBe(0)
+
+    const requestError = new Error('interceptor failed')
+    await expect(interceptors.request.rejected(requestError)).rejects.toBe(requestError)
+  })
+
+  it('不覆盖调用方 signal，也不把调用方控制器纳入全局取消', () => {
+    const interceptors = createAxiosInterceptorFake()
+    const callerController = new AbortController()
+    const config = interceptors.request.fulfilled({ signal: callerController.signal })
+
+    expect(config.signal).toBe(callerController.signal)
+    expect(getActiveRequestsCount()).toBe(0)
+
+    abortAllRequests()
+    expect(callerController.signal.aborted).toBe(false)
+
+    expect(interceptors.response.fulfilled({ config })).toEqual({ config })
+    expect(getActiveRequestsCount()).toBe(0)
+  })
+
+  it('导航开始时只取消当前活跃请求，导航结束不主动取消', () => {
+    const interceptors = createAxiosInterceptorFake()
+    const first = interceptors.request.fulfilled({})
+    const second = interceptors.request.fulfilled({})
+
+    setNavigatingState(false)
+    expect(first.signal?.aborted).toBe(false)
+    expect(second.signal?.aborted).toBe(false)
+    expect(getActiveRequestsCount()).toBe(2)
+
+    setNavigatingState(true)
+    expect(first.signal?.aborted).toBe(true)
+    expect(second.signal?.aborted).toBe(true)
+    expect(getActiveRequestsCount()).toBe(0)
+  })
+
+  it('手动全量取消会中断并清空所有自动管理的请求', () => {
+    const interceptors = createAxiosInterceptorFake()
+    const first = interceptors.request.fulfilled({})
+    const second = interceptors.request.fulfilled({})
+
+    abortAllRequests()
+
+    expect(first.signal?.aborted).toBe(true)
+    expect(second.signal?.aborted).toBe(true)
+    expect(getActiveRequestsCount()).toBe(0)
+  })
+})
diff --git a/src/utils/__tests__/sseManager.spec.ts b/src/utils/__tests__/sseManager.spec.ts
new file mode 100644
index 00000000..946c6a0d
--- /dev/null
+++ b/src/utils/__tests__/sseManager.spec.ts
@@ -0,0 +1,343 @@
+import { SSEManager, sseManagerSingleton, type SSEManagerOptions } from '@/utils/sseManager'
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
+
+/** 提供 SSEManager 生命周期测试所需的最小 EventSource 协议。 */
+class FakeEventSource {
+  static readonly CLOSED = 2
+  static readonly CONNECTING = 0
+  static readonly OPEN = 1
+  static instances: FakeEventSource[] = []
+  static throwOnNextConstruction = false
+
+  readonly url: string
+  readyState = FakeEventSource.CONNECTING
+  onerror: ((event: Event) => void) | null = null
+  onmessage: ((event: MessageEvent) => void) | null = null
+  onopen: ((event: Event) => void) | null = null
+  close = vi.fn(() => {
+    this.readyState = FakeEventSource.CLOSED
+  })
+
+  constructor(url: string | URL) {
+    if (FakeEventSource.throwOnNextConstruction) {
+      FakeEventSource.throwOnNextConstruction = false
+      throw new Error('EventSource construction failed')
+    }
+
+    this.url = String(url)
+    FakeEventSource.instances.push(this)
+  }
+
+  emit(data: unknown) {
+    this.onmessage?.(new MessageEvent('message', { data }))
+  }
+
+  fail() {
+    this.readyState = FakeEventSource.CLOSED
+    this.onerror?.(new Event('error'))
+  }
+
+  open() {
+    this.readyState = FakeEventSource.OPEN
+    this.onopen?.(new Event('open'))
+  }
+
+  static reset() {
+    FakeEventSource.instances = []
+    FakeEventSource.throwOnNextConstruction = false
+  }
+}
+
+const managerOptions: SSEManagerOptions = {
+  backgroundCloseDelay: 500,
+  maxReconnectAttempts: 2,
+  maxReconnectDelay: 150,
+  reconnectBackoffMultiplier: 10,
+  reconnectDelay: 100,
+}
+
+describe('SSEManager', () => {
+  const managers: SSEManager[] = []
+  let hidden = false
+
+  function createManager(options: Partial<SSEManagerOptions> = {}) {
+    const manager = new SSEManager('/api/events', { ...managerOptions, ...options })
+    managers.push(manager)
+    return manager
+  }
+
+  beforeEach(() => {
+    vi.useFakeTimers()
+    FakeEventSource.reset()
+    vi.stubGlobal('EventSource', FakeEventSource as unknown as typeof EventSource)
+    vi.spyOn(document, 'hidden', 'get').mockImplementation(() => hidden)
+    hidden = false
+  })
+
+  afterEach(() => {
+    managers.splice(0).forEach(manager => manager.destroy())
+    sseManagerSingleton.closeAllManagers()
+    vi.useRealTimers()
+    vi.restoreAllMocks()
+    vi.unstubAllGlobals()
+  })
+
+  it('首个监听器建连，多监听器共享连接且互不传播处理错误', () => {
+    const consoleError = vi.spyOn(console, 'error').mockImplementation(() => {})
+    const manager = createManager()
+    const firstMessageListener = vi.fn(() => {
+      throw new Error('message listener failed')
+    })
+    const secondMessageListener = vi.fn()
+    const failingStatusListener = vi.fn(() => {
+      throw new Error('status listener failed')
+    })
+    const statusListener = vi.fn()
+
+    manager.addStatusListener('failing-status', failingStatusListener, false)
+    manager.addStatusListener('status', statusListener)
+    manager.addMessageListener('first', firstMessageListener)
+    manager.addMessageListener('second', secondMessageListener)
+
+    expect(FakeEventSource.instances).toHaveLength(1)
+    expect(manager.status).toBe('connecting')
+    expect(manager.readyState).toBe(FakeEventSource.CONNECTING)
+    expect(manager.connectionUrl).toBe('/api/events')
+
+    const source = FakeEventSource.instances[0]
+    source.open()
+    source.emit({ id: 1 })
+
+    expect(manager.status).toBe('open')
+    expect(manager.readyState).toBe(FakeEventSource.OPEN)
+    expect(firstMessageListener).toHaveBeenCalledOnce()
+    expect(secondMessageListener).toHaveBeenCalledOnce()
+    expect(statusListener.mock.calls.map(([status]) => status)).toEqual(['idle', 'connecting', 'open'])
+    expect(consoleError).toHaveBeenCalledWith('SSE: 监听器错误 [first]', expect.any(Error))
+    expect(consoleError).toHaveBeenCalledWith('SSE: 状态监听器错误 [failing-status]', expect.any(Error))
+
+    manager.removeMessageListener('first')
+    expect(source.close).not.toHaveBeenCalled()
+
+    manager.removeMessageListener('second')
+    expect(source.close).toHaveBeenCalledOnce()
+    expect(manager.hasActiveListeners).toBe(false)
+    expect(manager.status).toBe('idle')
+  })
+
+  it('按退避上限重连并在达到最大次数后关闭', () => {
+    const manager = createManager()
+    manager.addMessageListener('listener', vi.fn())
+
+    FakeEventSource.instances[0].fail()
+    expect(manager.status).toBe('error')
+    expect(manager.currentReconnectAttempts).toBe(1)
+
+    vi.advanceTimersByTime(99)
+    expect(FakeEventSource.instances).toHaveLength(1)
+    vi.advanceTimersByTime(1)
+    expect(FakeEventSource.instances).toHaveLength(2)
+
+    FakeEventSource.instances[1].fail()
+    expect(manager.currentReconnectAttempts).toBe(2)
+    vi.advanceTimersByTime(149)
+    expect(FakeEventSource.instances).toHaveLength(2)
+    vi.advanceTimersByTime(1)
+    expect(FakeEventSource.instances).toHaveLength(3)
+
+    FakeEventSource.instances[2].fail()
+    expect(manager.status).toBe('closed')
+    expect(manager.currentReconnectAttempts).toBe(2)
+    expect(manager.hasReachedMaxAttempts).toBe(true)
+
+    vi.advanceTimersByTime(1_000)
+    expect(FakeEventSource.instances).toHaveLength(3)
+  })
+
+  it('成功建连后清零失败次数，并从首档延迟重新退避', () => {
+    const manager = createManager({ maxReconnectAttempts: 3 })
+    manager.addMessageListener('listener', vi.fn())
+
+    FakeEventSource.instances[0].fail()
+    vi.advanceTimersByTime(100)
+    FakeEventSource.instances[1].open()
+
+    expect(manager.status).toBe('open')
+    expect(manager.currentReconnectAttempts).toBe(0)
+    expect(manager.hasReachedMaxAttempts).toBe(false)
+
+    FakeEventSource.instances[1].fail()
+    vi.advanceTimersByTime(99)
+    expect(FakeEventSource.instances).toHaveLength(2)
+    vi.advanceTimersByTime(1)
+    expect(FakeEventSource.instances).toHaveLength(3)
+  })
+
+  it('EventSource 构造失败时记录错误并按相同策略恢复', () => {
+    const consoleError = vi.spyOn(console, 'error').mockImplementation(() => {})
+    const manager = createManager()
+    FakeEventSource.throwOnNextConstruction = true
+
+    manager.addMessageListener('listener', vi.fn())
+
+    expect(manager.status).toBe('error')
+    expect(manager.currentReconnectAttempts).toBe(1)
+    expect(consoleError).toHaveBeenCalledWith('SSE: 连接创建失败', expect.any(Error))
+
+    vi.advanceTimersByTime(100)
+    expect(FakeEventSource.instances).toHaveLength(1)
+    expect(manager.status).toBe('connecting')
+  })
+
+  it('短暂进入后台会取消延迟关闭，长期后台关闭后在前台恢复', () => {
+    const manager = createManager()
+    manager.addMessageListener('listener', vi.fn())
+    const source = FakeEventSource.instances[0]
+    source.open()
+
+    hidden = true
+    document.dispatchEvent(new Event('visibilitychange'))
+    vi.advanceTimersByTime(499)
+    expect(source.close).not.toHaveBeenCalled()
+
+    hidden = false
+    document.dispatchEvent(new Event('visibilitychange'))
+    vi.advanceTimersByTime(500)
+    expect(source.close).not.toHaveBeenCalled()
+
+    hidden = true
+    document.dispatchEvent(new Event('visibilitychange'))
+    vi.advanceTimersByTime(500)
+    expect(source.close).toHaveBeenCalledOnce()
+    expect(manager.status).toBe('closed')
+
+    hidden = false
+    document.dispatchEvent(new Event('visibilitychange'))
+    expect(FakeEventSource.instances).toHaveLength(2)
+    expect(manager.status).toBe('connecting')
+  })
+
+  it('close 清理待重连定时器并保留监听器供强制重连', () => {
+    const manager = createManager()
+    manager.addMessageListener('listener', vi.fn())
+    const firstSource = FakeEventSource.instances[0]
+
+    firstSource.fail()
+    expect(vi.getTimerCount()).toBe(1)
+
+    manager.close()
+    expect(firstSource.close).toHaveBeenCalledOnce()
+    expect(vi.getTimerCount()).toBe(0)
+    expect(manager.status).toBe('closed')
+    expect(manager.hasActiveListeners).toBe(true)
+
+    vi.advanceTimersByTime(1_000)
+    expect(FakeEventSource.instances).toHaveLength(1)
+
+    manager.forceReconnect()
+    expect(FakeEventSource.instances).toHaveLength(2)
+    expect(manager.status).toBe('connecting')
+  })
+
+  it('forceReconnect 取代待执行的自动重连，不会由旧定时器重复建连', () => {
+    const manager = createManager()
+    manager.addMessageListener('listener', vi.fn())
+
+    FakeEventSource.instances[0].fail()
+    expect(vi.getTimerCount()).toBe(1)
+
+    manager.forceReconnect()
+    expect(FakeEventSource.instances).toHaveLength(2)
+    expect(vi.getTimerCount()).toBe(0)
+
+    vi.advanceTimersByTime(1_000)
+    expect(FakeEventSource.instances).toHaveLength(2)
+  })
+
+  it('destroy 清理后台定时器、监听器和构造时注册的 DOM 订阅', () => {
+    const addDocumentListener = vi.spyOn(document, 'addEventListener')
+    const addWindowListener = vi.spyOn(window, 'addEventListener')
+    const removeDocumentListener = vi.spyOn(document, 'removeEventListener')
+    const removeWindowListener = vi.spyOn(window, 'removeEventListener')
+    const manager = createManager()
+    manager.addMessageListener('listener', vi.fn())
+    const source = FakeEventSource.instances[0]
+    source.open()
+    const visibilityHandler = addDocumentListener.mock.calls.find(([event]) => event === 'visibilitychange')?.[1]
+    const beforeUnloadHandler = addWindowListener.mock.calls.find(([event]) => String(event) === 'beforeunload')?.[1]
+
+    hidden = true
+    document.dispatchEvent(new Event('visibilitychange'))
+    expect(vi.getTimerCount()).toBe(1)
+
+    manager.destroy()
+    expect(source.close).toHaveBeenCalledOnce()
+    expect(vi.getTimerCount()).toBe(0)
+    vi.runAllTimers()
+
+    expect(FakeEventSource.instances).toHaveLength(1)
+    expect(manager.hasActiveListeners).toBe(false)
+    expect(manager.status).toBe('idle')
+    expect(removeDocumentListener).toHaveBeenCalledWith('visibilitychange', visibilityHandler)
+    expect(removeWindowListener).toHaveBeenCalledWith('beforeunload', beforeUnloadHandler)
+
+    manager.addMessageListener('ignored', vi.fn())
+    manager.forceReconnect()
+    expect(FakeEventSource.instances).toHaveLength(1)
+  })
+})
+
+describe('sseManagerSingleton', () => {
+  beforeEach(() => {
+    FakeEventSource.reset()
+    vi.stubGlobal('EventSource', FakeEventSource as unknown as typeof EventSource)
+    vi.spyOn(document, 'hidden', 'get').mockReturnValue(false)
+  })
+
+  afterEach(() => {
+    sseManagerSingleton.closeAllManagers()
+    vi.restoreAllMocks()
+    vi.unstubAllGlobals()
+  })
+
+  it('按 URL 复用共享实例，只有注册表关闭操作才替换 identity', () => {
+    const manager = sseManagerSingleton.getManager('/shared', managerOptions)
+    manager.addMessageListener('listener', vi.fn())
+    const source = FakeEventSource.instances[0]
+
+    expect(sseManagerSingleton.getManager('/shared')).toBe(manager)
+    expect(sseManagerSingleton.getManager('/other')).not.toBe(manager)
+
+    sseManagerSingleton.closeManager('/shared')
+    expect(source.close).toHaveBeenCalledOnce()
+    expect(manager.hasActiveListeners).toBe(false)
+
+    manager.forceReconnect()
+    expect(FakeEventSource.instances).toHaveLength(1)
+
+    const replacement = sseManagerSingleton.getManager('/shared', managerOptions)
+    expect(replacement).not.toBe(manager)
+  })
+
+  it('按 URL 与 listenerId 隔离独立实例，关闭指定注册项后重新创建', () => {
+    const first = sseManagerSingleton.getIndependentManager('/independent', 'first', managerOptions)
+    const second = sseManagerSingleton.getIndependentManager('/independent', 'second', managerOptions)
+    first.addMessageListener('first-listener', vi.fn())
+    second.addMessageListener('second-listener', vi.fn())
+    const firstSource = FakeEventSource.instances[0]
+
+    expect(sseManagerSingleton.getIndependentManager('/independent', 'first')).toBe(first)
+    expect(second).not.toBe(first)
+
+    sseManagerSingleton.closeIndependentManager('/independent', 'first')
+    expect(firstSource.close).toHaveBeenCalledOnce()
+    expect(first.hasActiveListeners).toBe(false)
+
+    first.forceReconnect()
+    expect(FakeEventSource.instances).toHaveLength(2)
+
+    const replacement = sseManagerSingleton.getIndependentManager('/independent', 'first', managerOptions)
+    expect(replacement).not.toBe(first)
+    expect(sseManagerSingleton.getIndependentManager('/independent', 'second')).toBe(second)
+  })
+})
diff --git a/vite.config.ts b/vite.config.ts
index b88493a8..1dcc095a 100644
--- a/vite.config.ts
+++ b/vite.config.ts
@@ -284,6 +284,8 @@ export default defineConfig(({ command, mode, isPreview }) => ({
       include: [
         'src/utils/recommendSources.ts',
         'src/utils/permission.ts',
+        'src/utils/requestOptimizer.ts',
+        'src/utils/sseManager.ts',
         'src/stores/auth.ts',
         'src/pages/recommend.vue',
         'src/pages/discover.vue',
@@ -498,6 +500,18 @@ export default defineConfig(({ command, mode, isPreview }) => ({
           lines: 80,
           statements: 80,
         },
+        'src/utils/requestOptimizer.ts': {
+          branches: 85,
+          functions: 90,
+          lines: 90,
+          statements: 90,
+        },
+        'src/utils/sseManager.ts': {
+          branches: 85,
+          functions: 90,
+          lines: 90,
+          statements: 90,
+        },
         'src/utils/searchStream.ts': {
           branches: 85,
           functions: 90,