Always install latest yt-dlp on build

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/Dockerfile

@@ -5,7 +5,7 @@ WORKDIR /app
 RUN apt-get update && apt-get install -y ffmpeg && rm -rf /var/lib/apt/lists/*
 
 COPY backend/requirements.txt ./backend/requirements.txt
-RUN pip install --no-cache-dir -r backend/requirements.txt
+RUN pip install --no-cache-dir -r backend/requirements.txt && pip install --no-cache-dir -U yt-dlp
 
 COPY backend/ ./backend/
 

backend/requirements.txt

@@ -5,6 +5,6 @@ python-jose[cryptography]==3.3.0
 bcrypt==5.0.0
 python-multipart==0.0.12
 pydantic-settings==2.6.1
-yt-dlp>=2024.11.18
+yt-dlp
 httpx==0.27.2
 aiofiles==24.1.0