add frontend Docker dev service on port 5173.

Vite hot reload via src bind mount; starts after backend health check passes.

docker-compose.dev.yml

@@ -52,6 +52,22 @@ services:
             retries: 20
             start_period: 10s
 
+    frontend:
+        build:
+            context: ./frontend
+            dockerfile: Dockerfile.dev
+        container_name: ${COMPOSE_PROJECT_NAME}_frontend
+        restart: unless-stopped
+        env_file:
+            - .env.dev
+        ports:
+            - '${FRONTEND_PORT}:5173'
+        volumes:
+            - ./frontend/src:/frontend/src
+        depends_on:
+            backend:
+                condition: service_healthy
+
 volumes:
     private_image_postgres_data:
     private_image_pgadmin_data:

frontend/Dockerfile.dev

@@ -0,0 +1,11 @@
+FROM node:20-alpine
+
+WORKDIR /frontend
+
+COPY package*.json .
+
+RUN npm ci
+
+ADD . .
+
+CMD ["npm", "run", "dev"]