feat: 监控面板 / 登录鉴权 / 多平台切换 / MySQL

在上游 MediaCrawler 之上新增一层：

- 监控层 api/monitor/ —— 多博主/多笔记的定时采集、指标快照差分、报表、
  企业微信通知。每轮采集写入独立目录，差分才成立。
- WebUI 登录鉴权 api/auth.py —— PBKDF2 口令 + 服务端会话，/api 全接口防护。
  WebSocket 单独加依赖：BaseHTTPMiddleware 对 ws 作用域直接放行，覆盖不到。
- 全局平台切换 + 能力矩阵 —— 如实区分「爬虫模块支持」与「监控层已接线」，
  未接通的平台直接拒绝建任务，而不是静默跑空。
- 监控库改用 MySQL 5.7（可回退 SQLite 供测试）：逐表强制 utf8mb4
  （服务端与库默认都是 latin1），启动校验所连 schema 以防写错库，
  连接池 recycle + pre_ping 应对 MySQL 的 8 小时空闲断连。

修复上游缺陷：

- xhs/core.py: 主页抓取失败会跳掉整个博主，导致一条作品都抓不到，
  而那份资料只喂给一个空函数。改为尽力而为，失败不中断。
- xhs/login.py: cookie 登录只注入 web_session，冷启动签名会失败。
  新增 INJECT_ALL_COOKIES 开关（默认关闭，原有行为不变）。
- requirements.txt: 补上 websockets。它在上游 pyproject.toml 里有声明、
  这里漏了，导致 uvicorn 没有 WebSocket 能力，实时日志流从未工作。

改动过的上游文件清单及合并方式见 UPSTREAM.md。

测试：492 passed（另有 1 个既有的 Windows/gbk 上游测试失败，与本改动无关）

api/schemas/crawler.py

@@ -78,6 +78,34 @@ class CrawlerStartRequest(BaseModel):
     max_notes_count: Optional[int] = Field(default=None, ge=1, le=MAX_API_LIMIT_COUNT)
     max_comments_count: Optional[int] = Field(default=None, ge=1, le=MAX_API_LIMIT_COUNT)
 
+    # --- Options only used by scheduled monitor runs. Each defaults to None so
+    # the corresponding CLI flag is omitted entirely for manual Crawl-tab runs,
+    # which keeps their behaviour byte-identical to before.
+
+    # Isolate this run's output in its own directory. The crawler's own file
+    # writer names files by date only, so same-day runs would otherwise append
+    # into one shared file and could not be told apart.
+    save_data_path: Optional[str] = None
+    # Unattended runs must not try to attach to the user's desktop Chrome.
+    enable_cdp_mode: Optional[bool] = None
+    # XHS cookie login only injects `web_session` by default, which is not enough
+    # to sign API requests from a cold browser profile.
+    inject_all_cookies: Optional[bool] = None
+    save_login_state: Optional[bool] = None
+    # Preferred over `cookies`: a value on the command line is visible in the
+    # process list.
+    cookies_file: Optional[str] = None
+    max_concurrency_num: Optional[int] = Field(default=None, ge=1, le=MAX_API_LIMIT_COUNT)
+
+    # Crawl-strategy and proxy knobs surfaced on the Settings page. Like the
+    # fields above, each stays None unless the caller sets it, so the CLI flag is
+    # omitted entirely and the config-file default applies.
+    crawler_max_sleep_sec: Optional[int] = Field(default=None, ge=0, le=600)
+    enable_ip_proxy: Optional[bool] = None
+    ip_proxy_pool_count: Optional[int] = Field(default=None, ge=1, le=100)
+    ip_proxy_provider_name: Optional[str] = None
+    static_proxy_url: Optional[str] = None
+
 
 class CrawlerStatusResponse(BaseModel):
     """Crawler status response"""