feat: fpw plugins, validation/crawl perf, WS stats, test DB isolation

- Add Free_Proxy_Website-style fpw_* plugins and register them
- Per-plugin crawl timeout (crawl_timeout_seconds=120); remove global crawl_timeout setting
- Validator: fix connect vs total timeout on save; SOCKS session LRU cache; drop redundant semaphore
- Validation handler uses single DB connection; batch upsert after crawl; WorkerPool put_nowait
- Remove unused max_retries from settings API/UI; settings maintenance SQL + init_db cleanup of deprecated keys
- WebSocket dashboard stats; ProxyList pool_filter and API alignment
- POST /api/proxies/delete-one for IPv6-safe deletes; task poll stops on 404
- pytest uses PROXYPOOL_DB_PATH=db/proxies.test.sqlite so tests do not wipe production DB
- .gitignore: explicit proxies.test.sqlite patterns; fix plugin_service ValidationException import

Made-with: Cursor

app/plugins/__init__.py

@@ -9,6 +9,15 @@ from .kuaidaili import KuaiDaiLiPlugin
 from .speedx import SpeedXPlugin
 from .yundaili import YunDaiLiPlugin
 from .proxyscrape import ProxyScrapePlugin
+from .fpw_proxy_list_download import FpwProxyListDownloadPlugin
+from .fpw_socks_ssl_proxy import FpwSocksSslProxyPlugin
+from .fpw_spys_one import FpwSpysOnePlugin
+from .fpw_proxynova import FpwProxynovaPlugin
+from .fpw_hidemy import FpwHidemyPlugin
+from .fpw_premproxy import FpwPremproxyPlugin
+from .fpw_freeproxylists import FpwFreeproxylistsPlugin
+from .fpw_gatherproxy import FpwGatherproxyPlugin
+from .fpw_checkerproxy import FpwCheckerproxyPlugin
 
 # 显式注册所有插件
 registry.register(Fate0Plugin)
@@ -19,3 +28,12 @@ registry.register(KuaiDaiLiPlugin)
 registry.register(SpeedXPlugin)
 registry.register(YunDaiLiPlugin)
 registry.register(ProxyScrapePlugin)
+registry.register(FpwProxyListDownloadPlugin)
+registry.register(FpwSocksSslProxyPlugin)
+registry.register(FpwSpysOnePlugin)
+registry.register(FpwProxynovaPlugin)
+registry.register(FpwHidemyPlugin)
+registry.register(FpwPremproxyPlugin)
+registry.register(FpwFreeproxylistsPlugin)
+registry.register(FpwGatherproxyPlugin)
+registry.register(FpwCheckerproxyPlugin)