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/video_players/base.py

@@ -23,8 +23,15 @@ class BaseVideoPlayer:
     """
 
     def __init__(self):
-        # Initialize HTTP client directly
-        self.client = httpx.AsyncClient(timeout=10.0, follow_redirects=True)
+        # Realistic browser headers to avoid blocking by video hosts
+        headers = {
+            "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36",
+            "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8",
+            "Accept-Language": "en-US,en;q=0.9,fr;q=0.8",
+            "Referer": "https://anime-sama.tv/",
+        }
+        # Initialize HTTP client with browser headers
+        self.client = httpx.AsyncClient(timeout=10.0, follow_redirects=True, headers=headers)
 
     @abstractmethod
     def can_handle(self, url: str) -> bool: