feat: add multiple video player support for Frieren S2 downloads

- Add Lpayer API decryption using AES (key: kiemtienmua911ca)
- Add yt-dlp extraction for bypassing player blocking
- Add HTTP 206 support for video validation (Range header)
- Add VidMoly .biz domain support (alternative to .to)
- Add SendVid extraction (working - downloaded S1 and S2 E1)
- Add player fallback system with caching per anime URL
- Add video URL validation before returning to downloader
- Update HTTP clients with realistic browser headers
- Add pycryptodome to requirements.txt
- Add test file for fallback system

Downloads working: SendVid (primary), Lpayer (403 issue), VidMoly (testing)

app/downloaders/__init__.py

@@ -63,7 +63,10 @@ class GenericDownloader(BaseDownloader):
     def can_handle(self, url: str) -> bool:
         return True
 
-    async def get_download_link(self, url: str) -> tuple[str, str]:
+    async def get_download_link(self, url: str, target_filename: str = None) -> tuple[str, str]:
+        # Just return the URL as-is
+        filename = target_filename or url.split('/')[-1] or "download"
+        return url, filename
         # Just return the URL as-is
         filename = url.split('/')[-1] or "download"
         return url, filename