fix: 修复添加记录后首页数据不刷新的问题

将缓存清除逻辑从 stats.js 路由移至 app.js 全局中间件，
确保 records.js 路由的写操作也能触发缓存清除。

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/app.js

@@ -5,6 +5,7 @@ const compression = require('compression');
 
 const config = require('./config');
 const logger = require('./utils/logger');
+const { clearUserCache } = require('./utils/cache');
 const db = require('./db');
 const { router: authRouter, auth } = require('./routes/auth');
 const statsRouter = require('./routes/stats');
@@ -30,6 +31,16 @@ app.use('/api', (req, res, next) => {
   next();
 });
 
+// 全局缓存清除中间件：在写操作完成后清除用户缓存
+app.use('/api', (req, res, next) => {
+  res.once('finish', () => {
+    if (['POST', 'DELETE', 'PUT', 'PATCH'].includes(req.method) && req.user?.id) {
+      clearUserCache(req.user.id);
+    }
+  });
+  next();
+});
+
 app.get('/api/contacts', auth, (req, res) => {
   const field = req.query.field;
   const allowed = ['boss', 'partner', 'source', 'destination'];