feat: add Docker support with single-port deployment

Add complete Docker configuration for containerized deployment:
- Multi-stage Dockerfile using official Bun runtime
- docker-compose.yml for single-port stack orchestration
- Host-mounted database volume with auto-initialization
- Custom database init script using bun:sqlite
- Entrypoint script for seamless database setup
- Environment configuration template
- Comprehensive DOCKER.md documentation

Key features:
- Single exposed port (3001) serving both API and frontend
- Database persists in ./data directory on host
- Auto-creates database from template on first startup
- Health checks for monitoring
- Architecture-agnostic (works on x86 and ARM64)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

docker-compose.yml

@@ -0,0 +1,31 @@
+services:
+  quickawards:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    container_name: quickawards
+    restart: unless-stopped
+    ports:
+      - "3001:3001"
+    environment:
+      # Application settings
+      NODE_ENV: production
+      PORT: 3001
+      LOG_LEVEL: info
+
+      # Security - IMPORTANT: Change these in production!
+      JWT_SECRET: ${JWT_SECRET:-change-this-in-production}
+
+      # CORS - Set to your domain in production
+      VITE_APP_URL: ${VITE_APP_URL:-}
+      ALLOWED_ORIGINS: ${ALLOWED_ORIGINS:-}
+    volumes:
+      # Host-mounted database directory
+      # Database will be created at ./data/award.db on first startup
+      - ./data:/data
+    healthcheck:
+      test: ["CMD", "wget", "--no-verbose", "--tries=1", "--spider", "http://localhost:3001/api/health"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 40s