feat: Full petmaster CRM with NestJS API and React frontend

- Client management (CRUD with JSONB custom fields)
- Pet profiles
- Service catalog with per-client pricing
- Booking calendar with recurring appointments
- Invoicing with Stripe integration
- Real-time messaging (WebSocket)
- Self-booking portal
- Staff assignment
- Docker multi-stage builds
- Prisma schema + seed

docker-compose.yml

@@ -0,0 +1,50 @@
+services:
+  postgres:
+    image: postgres:16-alpine
+    environment:
+      POSTGRES_DB: petmaster
+      POSTGRES_USER: petmaster
+      POSTGRES_PASSWORD: petmaster_secret
+    ports:
+      - "5432:5432"
+    volumes:
+      - pgdata:/var/lib/postgresql/data
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U petmaster"]
+      interval: 5s
+      timeout: 5s
+      retries: 5
+
+  api:
+    build:
+      context: ./api
+      dockerfile: Dockerfile
+    ports:
+      - "3000:3000"
+    environment:
+      DATABASE_URL: postgresql://petmaster:petmaster_secret@postgres:5432/petmaster?schema=public
+      STRIPE_SECRET_KEY: ${STRIPE_SECRET_KEY:-sk_test_placeholder}
+      STRIPE_WEBHOOK_SECRET: ${STRIPE_WEBHOOK_SECRET:-whsec_placeholder}
+      JWT_SECRET: ${JWT_SECRET:-change-me-in-production}
+      CORS_ORIGIN: http://localhost:3001
+    depends_on:
+      postgres:
+        condition: service_healthy
+    volumes:
+      - ./api/src:/app/src  # hot-reload in dev
+    command: >
+      sh -c "npx prisma migrate deploy && npm run start:dev"
+
+  web:
+    build:
+      context: ./web
+      dockerfile: Dockerfile
+    ports:
+      - "3001:3001"
+    environment:
+      REACT_APP_API_URL: http://localhost:3000
+    depends_on:
+      - api
+
+volumes:
+  pgdata: