fix(crawl): throttle concurrent CrawlJobs and relax fpw/proxyscrape HTTP

- CrawlJob waits on crawl_slot before JobExecutor semaphore so crawl-all does not fill slots while queued
- BaseHTTPPlugin: longer connect budget for slow international links
- proxyscrape: jsDelivr mirror + longer GitHub/API phases
- fpw_*: higher timeouts/retries; lower internal concurrency on heavy multi-URL plugins

Made-with: Cursor

app/plugins/fpw_proxy_list_download.py

@@ -13,7 +13,7 @@ class FpwProxyListDownloadPlugin(BaseHTTPPlugin):
 
     def __init__(self):
         super().__init__()
-        self.max_concurrency = 8
+        self.max_concurrency = 4
         self.api_pairs = [
             ("http", "https://www.proxy-list.download/api/v1/get?type=http"),
             ("https", "https://www.proxy-list.download/api/v1/get?type=https"),
@@ -30,7 +30,7 @@ class FpwProxyListDownloadPlugin(BaseHTTPPlugin):
     async def crawl(self) -> List[ProxyRaw]:
         results: List[ProxyRaw] = []
         urls = [u for _, u in self.api_pairs]
-        htmls = await self.fetch_all(urls, timeout=10, retries=1)
+        htmls = await self.fetch_all(urls, timeout=25, retries=2)
         for (protocol, _), text in zip(self.api_pairs, htmls):
             if not text:
                 continue
@@ -41,7 +41,7 @@ class FpwProxyListDownloadPlugin(BaseHTTPPlugin):
         if not results:
             logger.warning(f"{self.display_name} 主 API 无数据，尝试 ProxyScrape 备用")
             fb_urls = [u for _, u in self.fallback_pairs]
-            fb_htmls = await self.fetch_all(fb_urls, timeout=10, retries=1)
+            fb_htmls = await self.fetch_all(fb_urls, timeout=25, retries=2)
             for (protocol, _), text in zip(self.fallback_pairs, fb_htmls):
                 if not text:
                     continue