feat: 统一页面布局与字体样式

backend/src/routes/ai.routes.ts

@@ -109,12 +109,18 @@ router.post('/chat-stream', authMiddleware, async (req: AuthRequest, res, next)
     res.setHeader('Content-Type', 'text/event-stream')
     res.setHeader('Cache-Control', 'no-cache')
     res.setHeader('Connection', 'keep-alive')
+    res.setHeader('X-Accel-Buffering', 'no')
+    res.flushHeaders()
     let usageRecorded = false
     try {
       for await (const delta of chatStream(messages, orgContext)) {
         res.write(`data: ${JSON.stringify({ delta })}\n\n`)
+        if (typeof (res as any).flush === 'function') (res as any).flush()
       }
       res.write('data: [DONE]\n\n')
+    } catch (streamErr: any) {
+      res.write(`data: ${JSON.stringify({ error: streamErr.message || 'AI 服务异常' })}\n\n`)
+      res.write('data: [DONE]\n\n')
     } finally {
       if (!usageRecorded) {
         await recordUsage(req.user!.orgId, req.user!.id, 'chat')