feat(Production): Mount application code in PHP containers for live deployment

- Mount /home/deploy/michaelschiemer/current:/var/www/html:ro in php and queue-worker services
- This allows deployment via rsync without requiring Docker image rebuild
- Storage volume still mounted as writable overlay for runtime data
- Change default DB_DRIVER to 'pgsql' for PostgreSQL

Deployment Architecture:
- rsync deploys code to /home/deploy/michaelschiemer/releases/{timestamp}
- Atomic symlink switch to /home/deploy/michaelschiemer/current
- PHP containers mount current/ for immediate code updates
- No rebuild needed - code changes are live after symlink switch

Benefits:
- Faster deployments (no Docker rebuild)
- Code changes reflected immediately
- Zero-downtime releases
- Easy rollback via symlink change

docker-compose.production.yml

@@ -17,12 +17,17 @@ services:
     # Production restart policy
     restart: always
 
-    # Override volumes - use Let's Encrypt certificates
+    # Production port mappings for Let's Encrypt
+    ports:
+      - "80:80"      # HTTP for ACME challenge
+      - "443:443"    # HTTPS for production traffic
+
+    # Override volumes - use Let's Encrypt certificates and mount application code
     volumes:
       - certbot-conf:/etc/letsencrypt:ro
       - certbot-www:/var/www/certbot:ro
-      # Remove development host mounts for security
-      # Application code deployed via Docker image build
+      # Application code via rsync deployment
+      - /home/deploy/michaelschiemer/current:/var/www/html:ro
 
     environment:
       - APP_ENV=production
@@ -110,10 +115,11 @@ services:
           memory: 512M
           cpus: '1.0'
 
-    # Remove development volumes
+    # Production volumes
     volumes:
-      # Mount entire storage directory as single volume to avoid subdirectory mount issues
-      # on read-only overlay filesystem
+      # Mount application code from rsync deployment (read-only)
+      - /home/deploy/michaelschiemer/current:/var/www/html:ro
+      # Mount storage directory as writable volume (overlays the read-only code mount)
       - storage:/var/www/html/storage:rw
       # Mount .env file from shared directory (production environment variables)
       - /home/deploy/michaelschiemer/shared/.env.production:/var/www/html/.env:ro
@@ -203,10 +209,11 @@ services:
     # Worker command - executed after entrypoint setup
     command: ["php", "/var/www/html/worker.php"]
 
-    # Remove development volumes
+    # Production volumes
     volumes:
-      # Mount entire storage directory as single volume to avoid subdirectory mount issues
-      # on read-only overlay filesystem
+      # Mount application code from rsync deployment (read-only)
+      - /home/deploy/michaelschiemer/current:/var/www/html:ro
+      # Mount storage directory as writable volume (overlays the read-only code mount)
       - storage:/var/www/html/storage:rw
       # Mount .env file from shared directory (production environment variables)
       - /home/deploy/michaelschiemer/shared/.env.production:/var/www/html/.env:ro