fix: 修复路由竞态、删除确认、输入同步等交互问题

- router.js 添加竞态防护和页面清理钩子
- logs.js 切换 Tab 时清空搜索框
- models.js 删除 Provider 添加确认提示，输入框改 oninput 实时同步
- mcp.js 删除 Server 添加确认提示
- gateway.js Tailscale 地址为空时保留原配置

src/pages/gateway.js

@@ -107,7 +107,7 @@ async function saveConfig(page, state) {
   state.config.gateway = {
     ...state.config.gateway,
     port, bind, mode, authToken,
-    tailscale: tailscaleAddr ? { address: tailscaleAddr } : undefined,
+    tailscale: tailscaleAddr ? { address: tailscaleAddr } : (state.config.gateway?.tailscale || undefined),
   }
 
   try {

src/pages/logs.js

@@ -42,6 +42,7 @@ export async function render() {
       page.querySelectorAll('.tab').forEach(t => t.classList.remove('active'))
       tab.classList.add('active')
       currentTab = tab.dataset.tab
+      page.querySelector('#log-search').value = ''
       loadLog(page, currentTab)
     }
   })

src/pages/mcp.js

@@ -76,6 +76,7 @@ function renderServers(page, state) {
       const action = btn.dataset.action
 
       if (action === 'delete') {
+        if (!confirm(`确定删除 MCP Server "${key}"？`)) return
         if (state.config.mcpServers) delete state.config.mcpServers[key]
         else delete state.config[key]
         renderServers(page, state)

src/pages/models.js

@@ -102,6 +102,7 @@ function renderProviders(page, state) {
         const models = section.querySelector('.provider-models')
         models.style.display = models.style.display === 'none' ? 'block' : 'none'
       } else if (action === 'delete-provider') {
+        if (!confirm(`确定删除 Provider "${providerKey}"？`)) return
         delete state.config.models.providers[providerKey]
         renderProviders(page, state)
         toast(`已删除 ${providerKey}`, 'info')
@@ -124,9 +125,9 @@ function renderProviders(page, state) {
     }
   })
 
-  // 输入框变更同步到 state
+  // 输入框变更实时同步到 state
   listEl.querySelectorAll('[data-field]').forEach(input => {
-    input.onchange = () => {
+    input.oninput = () => {
       const providerKey = input.closest('[data-provider]').dataset.provider
       state.config.models.providers[providerKey][input.dataset.field] = input.value
     }

src/router.js

@@ -3,6 +3,8 @@
  */
 const routes = {}
 let _contentEl = null
+let _loadId = 0
+let _currentCleanup = null
 
 export function registerRoute(path, loader) {
   routes[path] = loader
@@ -23,16 +25,33 @@ async function loadRoute() {
   const loader = routes[hash]
   if (!loader || !_contentEl) return
 
+  // 竞态防护：记录本次加载 ID
+  const thisLoad = ++_loadId
+
+  // 清理上一个页面
+  if (_currentCleanup) {
+    try { _currentCleanup() } catch (_) {}
+    _currentCleanup = null
+  }
+
   _contentEl.innerHTML = ''
   const mod = await loader()
-  // 动态 import 返回模块对象，调用 render() 获取页面元素
+
+  // 如果加载期间路由又变了，丢弃本次结果
+  if (thisLoad !== _loadId) return
+
   const page = mod.render ? await mod.render() : mod.default ? await mod.default() : mod
+  if (thisLoad !== _loadId) return
+
   if (typeof page === 'string') {
     _contentEl.innerHTML = page
   } else if (page instanceof HTMLElement) {
     _contentEl.appendChild(page)
   }
 
+  // 保存页面清理函数
+  _currentCleanup = mod.cleanup || null
+
   // 更新侧边栏激活状态
   document.querySelectorAll('.nav-item').forEach(item => {
     item.classList.toggle('active', item.dataset.route === hash)