chore(docker): add development environment with hot reload

Add dev stage to Dockerfile and startup script
Create docker-compose.dev.yml for local development
Update README with Docker dev mode instructions

docker-compose.dev.yml

@@ -0,0 +1,31 @@
+services:
+  app:
+    build:
+      context: .
+      dockerfile: Dockerfile
+      target: dev
+    environment:
+      NODE_ENV: development
+      HOST: 0.0.0.0
+      NITRO_HOST: 0.0.0.0
+      PORT: 20013
+      CHOKIDAR_USEPOLLING: "true"
+      CHOKIDAR_INTERVAL: ${CHOKIDAR_INTERVAL:-1000}
+      WATCHPACK_POLLING: "true"
+      NUXT_DATABASE_URL: ${NUXT_DATABASE_URL:-postgresql://postgres:postgres@postgres:5432/dinner_ticket_system}
+      NUXT_REDIS_URL: ${NUXT_REDIS_URL:-redis://redis:6379}
+      NUXT_SESSION_COOKIE_NAME: ${NUXT_SESSION_COOKIE_NAME:-dinner_ticket_session}
+      NUXT_PUBLIC_APP_URL: ${NUXT_PUBLIC_APP_URL:-http://localhost:20013}
+      NUXT_PUBLIC_RP_NAME: ${NUXT_PUBLIC_RP_NAME:-Dinner Ticket System}
+    volumes:
+      - .:/app
+      - app_node_modules:/app/node_modules
+      - app_nuxt:/app/.nuxt
+    healthcheck:
+      start_period: 60s
+    tty: true
+    stdin_open: true
+
+volumes:
+  app_node_modules:
+  app_nuxt: