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_proxynova.py

@@ -0,0 +1,74 @@
+"""proxynova.com 表格内 JS 混淆 IP + 明文端口。"""
+import re
+from typing import List, Optional
+
+from bs4 import BeautifulSoup
+
+from app.core.plugin_system import ProxyRaw
+from app.plugins.base import BaseHTTPPlugin
+from app.core.log import logger
+
+
+class FpwProxynovaPlugin(BaseHTTPPlugin):
+    name = "fpw_proxynova"
+    display_name = "ProxyNova"
+    description = "proxynova.com 代理列表（解析 document.write 混淆 IP）"
+
+    def __init__(self):
+        super().__init__()
+        self.urls = ["https://www.proxynova.com/proxy-server-list/"]
+
+    @staticmethod
+    def _decode_proxynova_ip(script_inner: str) -> Optional[str]:
+        """解析 document.write(\".081.301\".split(\"\").reverse()...concat(\"118.174\"...))"""
+        m1 = re.search(r'document\.write\("([^"]+)"\.split', script_inner)
+        m2 = re.search(r'\.concat\("([^"]+)"', script_inner)
+        if not m1 or not m2:
+            return None
+        a, b = m1.group(1), m2.group(1)
+        part1 = "".join(reversed(a))
+        return part1 + b
+
+    def _parse_rows(self, html: str) -> List[ProxyRaw]:
+        soup = BeautifulSoup(html, "lxml")
+        tbody = soup.find("tbody")
+        if not tbody:
+            return []
+        out: List[ProxyRaw] = []
+        for tr in tbody.find_all("tr"):
+            tds = tr.find_all("td")
+            if len(tds) < 2:
+                continue
+            script = tds[0].find("script")
+            if not script or not script.string:
+                continue
+            ip = self._decode_proxynova_ip(script.string)
+            port_txt = tds[1].get_text(strip=True)
+            if not ip or not port_txt.isdigit():
+                continue
+            port = int(port_txt)
+            if not (1 <= port <= 65535):
+                continue
+            row_text = tr.get_text(" ", strip=True).upper()
+            if "SOCKS5" in row_text:
+                proto = "socks5"
+            elif "SOCKS4" in row_text:
+                proto = "socks4"
+            elif "HTTPS" in row_text:
+                proto = "https"
+            else:
+                proto = "http"
+            try:
+                out.append(ProxyRaw(ip, port, proto))
+            except ValueError:
+                continue
+        return out
+
+    async def crawl(self) -> List[ProxyRaw]:
+        html = await self.fetch(self.urls[0], timeout=14, retries=1)
+        if not html:
+            return []
+        results = self._parse_rows(html)
+        if results:
+            logger.info(f"{self.display_name} 解析 {len(results)} 条")
+        return results