fix: 修复爬虫网络层、验证队列卡死及 API 500 错误

- 修复 BaseHTTPPlugin 连接池、并发控制、异常日志、超时策略
- 修复/增强 8 个爬虫插件的稳定性和 fallback 机制
- 清理 validation_tasks 表 4 万+ pending 任务，避免队列卡死
- 修复 app/api/main.py 缺失全局 app 实例导致的 500 错误
- 提升前端 Axios 超时到 120 秒，避免请求断开
- 修复插件统计持久化和调度器生命周期问题

app/plugins/speedx.py

@@ -18,13 +18,18 @@ class SpeedXPlugin(BaseHTTPPlugin):
             "https://raw.githubusercontent.com/TheSpeedX/SOCKS-List/master/socks4.txt",
             "https://raw.githubusercontent.com/TheSpeedX/SOCKS-List/master/socks5.txt",
         ]
+        self.fallback_urls = [
+            "https://cdn.jsdelivr.net/gh/TheSpeedX/SOCKS-List@master/http.txt",
+            "https://cdn.jsdelivr.net/gh/TheSpeedX/SOCKS-List@master/socks4.txt",
+            "https://cdn.jsdelivr.net/gh/TheSpeedX/SOCKS-List@master/socks5.txt",
+        ]
 
-    async def crawl(self) -> List[ProxyRaw]:
+    def _parse_htmls(self, htmls: List[str], urls: List[str]) -> List[ProxyRaw]:
         results = []
-        for url in self.urls:
-            html = await self.fetch(url, timeout=30)
+        for idx, html in enumerate(htmls):
             if not html:
                 continue
+            url = urls[idx]
 
             # 根据 URL 判断协议
             protocol = "http"
@@ -33,7 +38,7 @@ class SpeedXPlugin(BaseHTTPPlugin):
             elif "socks4" in url:
                 protocol = "socks4"
 
-            for line in html.split("\n"):
+            for line in html.splitlines():
                 line = line.strip()
                 if not line or ":" not in line:
                     continue
@@ -46,6 +51,16 @@ class SpeedXPlugin(BaseHTTPPlugin):
                     if not port.isdigit() or not (1 <= int(port) <= 65535):
                         continue
                     results.append(ProxyRaw(ip, int(port), protocol))
+        return results
+
+    async def crawl(self) -> List[ProxyRaw]:
+        htmls = await self.fetch_all(self.urls, timeout=15)
+        results = self._parse_htmls(htmls, self.urls)
+
+        if not results:
+            logger.warning(f"{self.display_name} GitHub 源全部返回空，尝试 jsdelivr fallback")
+            htmls = await self.fetch_all(self.fallback_urls, timeout=15)
+            results = self._parse_htmls(htmls, self.fallback_urls)
 
         if results:
             logger.info(f"{self.display_name} 解析完成，获取 {len(results)} 个潜在代理")