fix: 修复 feedback 查询 LIMIT/OFFSET 参数类型错误

- 和 logs.ts 同样的问题，execute 对参数类型要求严格
- 改为直接嵌入 SQL 字符串

server/src/routes/feedback.ts

@@ -52,14 +52,15 @@ router.get('/', requireAdmin, async (req, res) => {
     )
     const total = (countResult as any[])[0].total
 
+    // LIMIT/OFFSET 直接嵌入 SQL（execute 对参数类型要求严格）
     const [rows] = await pool.execute(
       `SELECT f.*, u.nickname, u.avatar_url
        FROM feedbacks f
        LEFT JOIN users u ON f.user_id = u.id
        WHERE ${where}
        ORDER BY f.created_at DESC
-       LIMIT ? OFFSET ?`,
-      [...params, pageSize, offset]
+       LIMIT ${pageSize} OFFSET ${offset}`,
+      params
     )
 
     res.json({ code: 0, data: { list: rows, total, page, pageSize } })