feat(crawl): browser-like headers, HTTP/2, curl_cffi TLS fingerprint fallback

- get_headers(url): Referer, Sec-Fetch-*, sec-ch-ua, API vs HTML Accept
- httpx AsyncClient/ sync Client with optional HTTP/2 (h2 extra)
- On 403/429/503/520-523/525/567 or request errors, retry via curl_cffi chrome124 impersonate
- POST: Origin, Referer, Content-Type for form posts
- kuaidaili/ip3366: forward get_headers(url=...)

Made-with: Cursor

app/plugins/ip3366.py

@@ -1,5 +1,5 @@
 import re
-from typing import List
+from typing import List, Optional
 from bs4 import BeautifulSoup
 from app.core.plugin_system import ProxyRaw
 from app.plugins.base import BaseHTTPPlugin
@@ -26,8 +26,8 @@ class Ip3366Plugin(BaseHTTPPlugin):
             f"http://www.ip3366.net/free/?stype=2&page={i}" for i in range(1, max_pages + 1)
         ]
 
-    def get_headers(self) -> dict:
-        headers = super().get_headers()
+    def get_headers(self, url: Optional[str] = None, **kwargs) -> dict:
+        headers = super().get_headers(url=url, **kwargs)
         headers["Referer"] = "http://www.ip3366.net/free/"
         return headers