✨ feat(ai): 补齐 Cursor 与 CodeBuddy 会话态聊天链路

- 新增 SessionChatProvider 接口，补齐非流式对话的会话态复用能力
- 为 Cursor Agent 和 CodeBuddy CLI 同步实现流式与非流式会话续接及状态持久化
- CustomProvider 补充会话态透传，统一 custom provider 的会话复用行为
- Service 新增 AIChatSendInSession，聊天主链路非流式回退改走带 session 的发送接口
- 保留原 AIChatSend 无状态语义，避免标题生成和记忆压缩污染主会话上下文
- 补充前后端定向测试，覆盖会话恢复、续接发送和前端回退分流

frontend/src/components/ai/aiChatPayloadDispatch.test.ts

@@ -38,8 +38,8 @@ describe('aiChatPayloadDispatch', () => {
     expect(setSending).not.toHaveBeenCalled();
   });
 
-  it('appends a non-stream assistant message when only AIChatSend is available', async () => {
-    const AIChatSend = vi.fn().mockResolvedValue({
+  it('appends a non-stream assistant message when session-aware send is available', async () => {
+    const AIChatSendInSession = vi.fn().mockResolvedValue({
       success: true,
       content: 'done',
       reasoning_content: 'thinking',
@@ -51,7 +51,7 @@ describe('aiChatPayloadDispatch', () => {
     (globalThis as any).window = {
       go: {
         aiservice: {
-          Service: { AIChatSend },
+          Service: { AIChatSendInSession },
         },
       },
     };
@@ -67,6 +67,7 @@ describe('aiChatPayloadDispatch', () => {
     });
 
     expect(result).toBe('send');
+    expect(AIChatSendInSession).toHaveBeenCalledWith('session-1', [{ role: 'user', content: 'hello' }], []);
     expect(addAIChatMessage).toHaveBeenCalledWith('session-1', expect.objectContaining({
       id: 'msg-send',
       role: 'assistant',
@@ -79,7 +80,7 @@ describe('aiChatPayloadDispatch', () => {
   });
 
   it('settles the pending assistant message when falling back to non-stream send', async () => {
-    const AIChatSend = vi.fn().mockResolvedValue({
+    const AIChatSendInSession = vi.fn().mockResolvedValue({
       success: true,
       content: 'done',
       reasoning_content: 'thinking',
@@ -91,7 +92,7 @@ describe('aiChatPayloadDispatch', () => {
     (globalThis as any).window = {
       go: {
         aiservice: {
-          Service: { AIChatSend },
+          Service: { AIChatSendInSession },
         },
       },
     };
@@ -108,6 +109,7 @@ describe('aiChatPayloadDispatch', () => {
     });
 
     expect(result).toBe('send');
+    expect(AIChatSendInSession).toHaveBeenCalledWith('session-1', [{ role: 'user', content: 'hello' }], []);
     expect(addAIChatMessage).not.toHaveBeenCalled();
     expect(updateAIChatMessage).toHaveBeenCalledWith('session-1', 'assistant-connecting', expect.objectContaining({
       content: 'done',
@@ -119,6 +121,44 @@ describe('aiChatPayloadDispatch', () => {
     expect(setSending).toHaveBeenCalledWith(false);
   });
 
+  it('falls back to stateless AIChatSend when session-aware send is unavailable', async () => {
+    const AIChatSend = vi.fn().mockResolvedValue({
+      success: true,
+      content: 'done',
+      reasoning_content: 'thinking',
+    });
+    const addAIChatMessage = vi.fn();
+    const setSending = vi.fn();
+
+    (globalThis as any).window = {
+      go: {
+        aiservice: {
+          Service: { AIChatSend },
+        },
+      },
+    };
+
+    const result = await dispatchAIChatPayload({
+      sid: 'session-1',
+      messages: [{ role: 'user', content: 'hello' }],
+      tools: [],
+      addAIChatMessage,
+      setSending,
+      nextMessageId: () => 'msg-send',
+    });
+
+    expect(result).toBe('send');
+    expect(AIChatSend).toHaveBeenCalledWith([{ role: 'user', content: 'hello' }], []);
+    expect(addAIChatMessage).toHaveBeenCalledWith('session-1', expect.objectContaining({
+      id: 'msg-send',
+      role: 'assistant',
+      content: 'done',
+      thinking: 'thinking',
+      reasoning_content: 'thinking',
+    }));
+    expect(setSending).toHaveBeenCalledWith(false);
+  });
+
   it('emits the unavailable message when the AI service is missing', async () => {
     const addAIChatMessage = vi.fn();
     const setSending = vi.fn();

frontend/src/components/ai/aiChatPayloadDispatch.ts

@@ -8,6 +8,7 @@ import { sanitizeErrorMsg } from '../../utils/aiChatRuntime';
 
 interface AIChatService {
   AIChatStream?: (sid: string, messages: any[], tools: AIChatToolDefinition[]) => Promise<any>;
+  AIChatSendInSession?: (sid: string, messages: any[], tools: AIChatToolDefinition[]) => Promise<any>;
   AIChatSend?: (messages: any[], tools: AIChatToolDefinition[]) => Promise<any>;
 }
 
@@ -92,8 +93,10 @@ export const dispatchAIChatPayload = async ({
       return 'stream';
     }
 
-    if (service?.AIChatSend) {
-      const result = await service.AIChatSend(messages, tools);
+    if (service?.AIChatSendInSession || service?.AIChatSend) {
+      const result = service?.AIChatSendInSession
+        ? await service.AIChatSendInSession(sid, messages, tools)
+        : await service!.AIChatSend!(messages, tools);
       const rawError = result?.error || '未知错误';
       const cleanError = sanitizeErrorMsg(rawError);
 

frontend/wailsjs/go/aiservice/Service.d.ts

@@ -8,6 +8,8 @@ export function AIChatCancel(arg1:string):Promise<void>;
 
 export function AIChatSend(arg1:Array<ai.Message>,arg2:Array<ai.Tool>):Promise<Record<string, any>>;
 
+export function AIChatSendInSession(arg1:string,arg2:Array<ai.Message>,arg3:Array<ai.Tool>):Promise<Record<string, any>>;
+
 export function AIChatStream(arg1:string,arg2:Array<ai.Message>,arg3:Array<ai.Tool>):Promise<void>;
 
 export function AICheckSQL(arg1:string):Promise<ai.SafetyResult>;

frontend/wailsjs/go/aiservice/Service.js

@@ -14,6 +14,10 @@ export function AIChatSend(arg1, arg2) {
   return window['go']['aiservice']['Service']['AIChatSend'](arg1, arg2);
 }
 
+export function AIChatSendInSession(arg1, arg2, arg3) {
+  return window['go']['aiservice']['Service']['AIChatSendInSession'](arg1, arg2, arg3);
+}
+
 export function AIChatStream(arg1, arg2, arg3) {
   return window['go']['aiservice']['Service']['AIChatStream'](arg1, arg2, arg3);
 }