fix: resolve 10 code review issues

High priority:
- Fix concurrent race condition for view_count/like_count (atomic update)
- Add route request ID tracking to prevent race conditions
- Filter get_joke by status=approved (no pending content leak)
- Add error feedback for like button

Performance:
- Optimize random joke query (avoid full table sort)
- Limit page_size max to 100 (DoS prevention)

Medium:
- Add localStorage quota error handling
- Handle empty AI response gracefully
- Fix generate content title extraction

Low:
- Add rejected_jokes to stats API
- Update dashboard to show rejected count

optimizer/main.py

@@ -0,0 +1,100 @@
+"""
+笑话优化 CLI 工具。
+循环检测所有笑话 → AI 质量检测 → AI 润色 → AI 评价分类。
+
+用法:
+  python optimizer/main.py                           # 处理所有 pending/approved 笑话
+  python optimizer/main.py --status rejected          # 只处理已拒绝的
+  python optimizer/main.py --limit 10                 # 只处理前 10 条
+  python optimizer/main.py --id 1,2,3                 # 指定 ID 处理
+  python optimizer/main.py --api-url http://localhost:8001
+"""
+
+import argparse
+import os
+import sys
+
+sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+
+from optimizer.optimizer import Optimizer
+
+
+def parse_args():
+    parser = argparse.ArgumentParser(description="笑话优化工具 — 质量检测 / AI 润色 / 评价分类")
+
+    parser.add_argument(
+        "--api-url",
+        type=str,
+        default=os.getenv("API_URL", "http://localhost:8001"),
+        help="API 地址（默认: http://localhost:8001）",
+    )
+    parser.add_argument(
+        "--username",
+        type=str,
+        default=os.getenv("API_USERNAME", "admin"),
+        help="管理员用户名（默认: admin）",
+    )
+    parser.add_argument(
+        "--password",
+        type=str,
+        default=os.getenv("API_PASSWORD", "admin123"),
+        help="管理员密码（默认: admin123）",
+    )
+    parser.add_argument(
+        "--status",
+        type=str,
+        default=None,
+        choices=["pending", "approved", "rejected"],
+        help="按状态筛选（默认: 全部）",
+    )
+    parser.add_argument(
+        "--limit",
+        type=int,
+        default=None,
+        help="最多处理 N 条（默认: 全部）",
+    )
+    parser.add_argument(
+        "--id",
+        type=str,
+        default=None,
+        dest="ids",
+        help="指定笑话 ID，逗号分隔（如: 1,2,3）",
+    )
+
+    return parser.parse_args()
+
+
+def main():
+    args = parse_args()
+
+    ids = None
+    if args.ids:
+        ids = [int(x.strip()) for x in args.ids.split(",") if x.strip()]
+
+    print(f"=" * 50)
+    print(f"笑话优化工具")
+    print(f"API 地址: {args.api_url}")
+    print(f"筛选状态: {args.status or '全部'}")
+    if args.limit:
+        print(f"处理上限: {args.limit} 条")
+    if ids:
+        print(f"指定 ID: {ids}")
+    print(f"=" * 50)
+
+    optimizer = Optimizer(
+        api_base=args.api_url,
+        username=args.username,
+        password=args.password,
+    )
+
+    try:
+        optimizer.run(status=args.status, limit=args.limit, ids=ids)
+    except KeyboardInterrupt:
+        print("\n用户中断")
+    except Exception as e:
+        print(f"\n[!] 运行错误: {e}")
+        sys.exit(1)
+
+
+if __name__ == "__main__":
+    main()