Harden media health checks and duration extraction

.env.example

@@ -50,6 +50,8 @@ QUEUE_WORKER_CONCURRENCY=5
 
 STORAGE_PROVIDER=local
 STORAGE_BASE_PATH=uploads
+# In Docker/production with local storage, mount a persistent volume to /app/uploads
+# or to the runtime path resolved from STORAGE_BASE_PATH.
 # Leave empty for local storage unless you want a dedicated CDN/base URL.
 STORAGE_PUBLIC_BASE_URL=
 S3_BUCKET=
@@ -76,6 +78,8 @@ VIDEO_PROCESSING_GENERATE_THUMBNAILS=true
 VIDEO_PROCESSING_GENERATE_HLS=true
 VIDEO_PROCESSING_HLS_SEGMENT_DURATION_SECONDS=4
 VIDEO_PROCESSING_THUMBNAIL_WIDTH=720
+AUDIO_PROCESSING_ENABLED=false
+AUDIO_WAVEFORM_PEAKS=48
 
 GOOGLE_CLIENT_ID=your_google_client_id
 GOOGLE_CLIENT_SECRET=your_google_client_secret