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/fpw_hidemy.py

@@ -0,0 +1,38 @@
+"""hidemyna.me 免费代理列表表格。"""
+from typing import List
+
+from app.core.plugin_system import ProxyRaw
+from app.plugins.base import BaseHTTPPlugin
+from app.core.log import logger
+
+
+class FpwHidemyPlugin(BaseHTTPPlugin):
+    name = "fpw_hidemy"
+    display_name = "HideMy.name"
+    description = "hidemyna.me 英文代理列表（HTTP/HTTPS/SOCKS）"
+
+    def __init__(self):
+        super().__init__()
+        self.urls = [
+            "https://hidemyna.me/en/proxy-list/",
+            "https://hidemyna.me/en/proxy-list/?type=hs",
+            "https://hidemyna.me/en/proxy-list/?type=socks4",
+        ]
+
+    async def crawl(self) -> List[ProxyRaw]:
+        results: List[ProxyRaw] = []
+        htmls = await self.fetch_all(self.urls, timeout=12, retries=1)
+        for url, html in zip(self.urls, htmls):
+            if not html:
+                continue
+            batch = self.parse_html_table(
+                html,
+                column_map={"ip": 0, "port": 1, "protocol": 4},
+                protocol="http",
+            )
+            if batch:
+                results.extend(batch)
+                logger.info(f"{self.display_name} {url}: {len(batch)} 条")
+        if results:
+            logger.info(f"{self.display_name} 合计 {len(results)} 条")
+        return results