Refactor Docker setup for environment flexibility and dev support

Moved environment variables to .env.template for better management and updated docker-compose files to use them. Added separate docker-compose.dev.yml for development, a Makefile for streamlined commands, and split backend Dockerfile into development and production stages. Updated .gitignore to include new changes.

docker-compose.dev.yml

@@ -0,0 +1,74 @@
+services:
+  db:
+    image: postgres:17-alpine
+    volumes:
+      - postgres_data_dev:/var/lib/postgresql/data/
+    environment:
+      - POSTGRES_USER=${POSTGRES_USER}
+      - POSTGRES_PASSWORD=${POSTGRES_PASSWORD}
+      - POSTGRES_DB=${POSTGRES_DB}
+    ports:
+      - "5432:5432"
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U ${POSTGRES_USER}"]
+      interval: 5s
+      timeout: 5s
+      retries: 5
+    networks:
+      - app-network
+
+  backend:
+    build:
+      context: ./backend
+      dockerfile: Dockerfile
+      target: development
+    volumes:
+      - ./backend:/app
+      - ./uploads:/app/uploads
+      - backend_dev_modules:/app/.venv
+    ports:
+      - "8000:8000"
+    environment:
+      - DATABASE_URL=${DATABASE_URL}
+      - SECRET_KEY=${SECRET_KEY}
+      - ENVIRONMENT=development
+      - DEBUG=true
+      - BACKEND_CORS_ORIGINS=${BACKEND_CORS_ORIGINS}
+    depends_on:
+      db:
+        condition: service_healthy
+    networks:
+      - app-network
+    command: ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000", "--reload"]
+
+  frontend:
+    build:
+      context: ./frontend
+      dockerfile: Dockerfile
+      target: deps
+      args:
+        - NEXT_PUBLIC_API_URL=${NEXT_PUBLIC_API_URL}
+    volumes:
+      - ./frontend:/app
+      - frontend_dev_modules:/app/node_modules
+      - frontend_dev_next:/app/.next
+    ports:
+      - "3000:3000"
+    environment:
+      - NODE_ENV=development
+      - NEXT_PUBLIC_API_URL=${NEXT_PUBLIC_API_URL}
+    depends_on:
+      - backend
+    command: npm run dev
+    networks:
+      - app-network
+
+volumes:
+  postgres_data_dev:
+  backend_dev_modules:
+  frontend_dev_modules:
+  frontend_dev_next:
+
+networks:
+  app-network:
+    driver: bridge