Phase 2.1: Backend project initialized with Docker configuration

- Created Cargo.toml with all required dependencies
- Implemented health/ready endpoints
- Added Docker configuration (production + development)
- Configured docker-compose with resource limits
- Set up MongoDB service with persistence
- Verified build (cargo check passed)
- Prepared monorepo structure for mobile/web/shared

Next: Phase 2.2 (MongoDB connection and models)

backend/docker-compose.dev.yml

@@ -0,0 +1,45 @@
+version: '3.8'
+services:
+  backend:
+    build:
+      context: .
+      dockerfile: docker/Dockerfile.dev
+    container_name: normogen-backend-dev
+    ports:
+      - '6000:8000'
+    volumes:
+      - ./src:/app/src
+    environment:
+      - RUST_LOG=debug
+      - SERVER_PORT=8000
+      - MONGODB_URI=mongodb://mongodb:27017
+      - MONGODB_DATABASE=normogen_dev
+    depends_on:
+      mongodb:
+        condition: service_healthy
+    networks:
+      - normogen-network
+    restart: unless-stopped
+  mongodb:
+    image: mongo:6.0
+    container_name: normogen-mongodb-dev
+    ports:
+      - '27017:27017'
+    environment:
+      - MONGO_INITDB_DATABASE=normogen_dev
+    volumes:
+      - mongodb_dev_data:/data/db
+    networks:
+      - normogen-network
+    healthcheck:
+      test: ['CMD', 'mongosh', '--eval', 'db.adminCommand.ping()']
+      interval: 10s
+      timeout: 5s
+      retries: 5
+      start_period: 10s
+volumes:
+  mongodb_dev_data:
+    driver: local
+networks:
+  normogen-network:
+    driver: bridge