fix: Resolve Docker permission issues in development environment

- Create dedicated Dockerfile.backend.dev for development with proper permissions
- Set user UID/GID to 1000 (common for development systems)
- Create logs and temp directories in Dockerfile before switching user
- Use named volumes for logs, temp, and node_modules to maintain permissions
- Mount only source files instead of entire backend directory
- Remove complex entrypoint script in favor of simple CMD
- Add LOG_DIR and TEMP_DIR environment variables

This fixes the "Permission denied" errors when creating directories in Docker.

🤖 Generated with [Claude Code](https://claude.ai/code)

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

docker-compose.dev.yml

@@ -8,26 +8,30 @@ services:
   backend:
     build:
       context: ./backend
-      dockerfile: ../docker/Dockerfile.backend
+      dockerfile: ../docker/Dockerfile.backend.dev
     container_name: minio-webui-backend-dev
     restart: unless-stopped
     environment:
       NODE_ENV: development
       PORT: 7510
+      LOG_DIR: /app/logs
+      TEMP_DIR: /app/temp
     env_file:
       - .env
     ports:
       - "7510:7510"
     volumes:
-      - ./backend:/app
-      - /app/node_modules
-      - ./logs:/app/logs
+      - ./backend/src:/app/src
+      - ./backend/package.json:/app/package.json
+      - ./backend/package-lock.json:/app/package-lock.json
+      - backend-logs:/app/logs
+      - backend-temp:/app/temp
+      - backend-node-modules:/app/node_modules
       - ~/.mc:/home/nodejs/.mc:ro
     depends_on:
       - redis
     networks:
       - minio-webui-network
-    command: npm run dev
 
   frontend:
     build:
@@ -68,6 +72,12 @@ services:
 volumes:
   redis-data:
     driver: local
+  backend-logs:
+    driver: local
+  backend-temp:
+    driver: local
+  backend-node-modules:
+    driver: local
 
 networks:
   minio-webui-network: