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/models/domain.py

@@ -22,6 +22,7 @@ class ProxyRaw:
 @dataclass
 class Proxy:
     """数据库中的代理实体"""
+
     ip: str
     port: int
     protocol: str
@@ -29,6 +30,7 @@ class Proxy:
     response_time_ms: Optional[float] = None
     last_check: Optional[datetime] = None
     created_at: Optional[datetime] = None
+    validated: int = 0  # 0 待验证 1 已验证（可参与分数与对外取用）
 
 
 @dataclass
@@ -46,7 +48,12 @@ class PluginInfo:
 
 @dataclass
 class CrawlResult:
-    """插件爬取结果"""
+    """插件爬取结果
+
+    success_count: 最近一轮成功爬取到的代理条数（去重后），非「验证通过数」
+    failure_count: 最近一轮是否爬取失败（健康检查/超时/异常为 1，否则为 0）
+    """
+
     plugin_name: str
     proxies: List[ProxyRaw] = field(default_factory=list)
     success_count: int = 0