feat: improve container setup and fix deployment issues

- Move images directory from /data/images to /app/images to separate app data from user media
- Implement config folder approach instead of direct file mounting
- Add automatic config initialization with example config on first boot
- Remove hardcoded media directory environment variables from Dockerfile
- Update startup script to handle config folder setup and validation
- Only create application-managed directories, not user media directories
- Update docker-compose.yaml to use config folder volume mapping

Fixes container startup failures when config.toml doesn't exist and improves
separation between application data and user media directories.

docker-compose.yaml

@@ -4,10 +4,12 @@ services:
     ports:
       - "8000:8000"
     environment:
-      - CONFIG_FILE=/app/config.toml
+      - CONFIG_DIR=/app/config
     volumes:
-      - ./data/:/data/
-      - ./config.toml:/app/config.toml
+      # Mount your actual media directories here - these paths should match your config.toml
+      - ./data/:/data/  # Example: change ./data/ to your actual media root
+      # Config folder for application configuration
+      - ./config/:/app/config/
   db:
     image: postgres:latest
     restart: unless-stopped