Fix Docker deployment and runtime environment variables

- Add --break-system-packages flag to pip install for Alpine Linux 3.12+ compatibility
- Configure Astro server to bind to 0.0.0.0 for Docker container accessibility
- Replace import.meta.env with process.env for runtime environment variable access in SSR
- Enable dynamic LOGIN configuration at runtime

Co-Authored-By: Warp <agent@warp.dev>

Dockerfile

@@ -8,7 +8,7 @@ RUN apk add --no-cache \
     python3 \
     py3-pip \
     ffmpeg \
-    && pip3 install --no-cache-dir yt-dlp
+    && pip3 install --no-cache-dir --break-system-packages yt-dlp
 
 WORKDIR /app