Add video optimization and following-first feed

.env.example

@@ -58,6 +58,15 @@ S3_ENDPOINT=
 S3_ACCESS_KEY_ID=
 S3_SECRET_ACCESS_KEY=
 S3_FORCE_PATH_STYLE=false
+VIDEO_PROCESSING_ENABLED=false
+VIDEO_PROCESSING_FFMPEG_PATH=ffmpeg
+VIDEO_PROCESSING_MAX_WIDTH=1280
+VIDEO_PROCESSING_MAX_FPS=30
+VIDEO_PROCESSING_CRF=28
+VIDEO_PROCESSING_PRESET=veryfast
+VIDEO_PROCESSING_AUDIO_BITRATE_KBPS=128
+VIDEO_PROCESSING_GENERATE_THUMBNAILS=true
+VIDEO_PROCESSING_THUMBNAIL_WIDTH=720
 
 GOOGLE_CLIENT_ID=your_google_client_id
 GOOGLE_CLIENT_SECRET=your_google_client_secret