fix: restore coding history and quota feedback

tests/unit/ai-proxy-routes.test.ts

@@ -274,6 +274,40 @@ describe('ai proxy routes', () => {
     expect(response.body()).toBe(JSON.stringify({ error: 'user quota is not enough' }));
   });
 
+  it('maps the observed token-point balance 403 to a non-retryable quota response', async () => {
+    seedWorksSquareAIGatewayCredential({
+      accessToken: 'ws-ai-token',
+      expiresIn: 3600,
+      oneApiBaseUrl: 'https://one-api.example.com/v1',
+    });
+    const body = JSON.stringify({
+      error: {
+        message: '词元点数余额不足',
+        code: 'token_point_balance_exhausted',
+        type: 'one_api_error',
+      },
+    });
+    const fetchMock = vi.fn().mockResolvedValueOnce(
+      new Response(body, {
+        status: 403,
+        headers: { 'content-type': 'application/json' },
+      }),
+    );
+    vi.stubGlobal('fetch', fetchMock);
+    const response = createResponse();
+
+    await handleAiProxyRoutes(
+      createRequest('POST', { model: 'deepseek-v4-flash', messages: [] }),
+      response.res,
+      new URL('http://127.0.0.1:13210/api/ai-proxy/v1/chat/completions'),
+      {} as never,
+    );
+
+    expect(fetchMock).toHaveBeenCalledOnce();
+    expect(response.statusCode).toBe(402);
+    expect(response.body()).toBe(body);
+  });
+
   it('maps rolling-window quota exhaustion to a non-retryable response status', async () => {
     seedWorksSquareAIGatewayCredential({
       accessToken: 'ws-ai-token',