feat: add Phase 1 infrastructure skeleton

Backend (FastAPI):
- docker-compose with all 4 services
- FastAPI app with health endpoints
- SQLAlchemy models for all tables
- Placeholder API endpoints for all routes
- Config and database modules
- requirements.txt with all dependencies

Frontend (React):
- package.json with React, Tailwind, React Query, React Router
- Vite config with API proxy
- Tailwind and TypeScript configs
- Basic App with routing skeleton
- Placeholder pages (Dashboard, MealDetail, Pantry)

Infrastructure:
- nginx config for reverse proxy
- Dockerfile for backend and frontend

docker-compose.yml

@@ -0,0 +1,64 @@
+version: "3.8"
+
+services:
+  backend:
+    build:
+      context: ./backend
+      dockerfile: Dockerfile
+    ports:
+      - "8000:8000"
+    environment:
+      - DATABASE_URL=postgresql://mealplanner:${POSTGRES_PASSWORD}@db:5432/mealplanner
+      - SENDGRID_API_KEY=${SENDGRID_API_KEY}
+      - LUCKY_CA_URL=${LUCKY_CA_URL}
+      - AI_IMAGE_ENABLED=${AI_IMAGE_ENABLED}
+      - LOG_LEVEL=${LOG_LEVEL:-INFO}
+    depends_on:
+      db:
+        condition: service_healthy
+    restart: unless-stopped
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:8000/health"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+
+  frontend:
+    build:
+      context: ./frontend
+      dockerfile: Dockerfile
+    ports:
+      - "3000:80"
+    depends_on:
+      - backend
+    restart: unless-stopped
+
+  db:
+    image: postgres:15-alpine
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+    environment:
+      - POSTGRES_USER=mealplanner
+      - POSTGRES_PASSWORD=${POSTGRES_PASSWORD}
+      - POSTGRES_DB=mealplanner
+    restart: unless-stopped
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U mealplanner -d mealplanner"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+
+  nginx:
+    image: nginx:alpine
+    ports:
+      - "80:80"
+      - "443:443"
+    volumes:
+      - ./nginx/nginx.conf:/etc/nginx/nginx.conf:ro
+    depends_on:
+      - frontend
+      - backend
+    restart: unless-stopped
+
+volumes:
+  postgres_data: