feat: MTG database integration with Redis caching

- Added MTG card ORM models (mtg_cards, mtg_sets tables)
- Created card_database service with search, get_by_name, get_by_set
- Added Redis client with caching layer (3600s TTL default)
- Created card router with caching on all endpoints:
  - Search cards (5min cache)
  - Get card by name (10min cache)
  - Get cards by set (15min cache)
  - Get card types/rarities (30min cache)
  - Get sets (1hr cache)
  - Get statistics (1hr cache)
- Updated settings.py:
  - Added JWT_SECRET_KEY field
  - Added DB_CONFIG and REDIS_CONFIG dictionaries
- Updated security.py to use JWT_SECRET_KEY with fallback
- Updated auth.py to use timezone-aware datetimes
- Updated refresh_mtg.py to use settings instead of os.environ
- Updated mtg_monitor.py to use settings for connections
- Added services package with __init__.py

All 20 tests passing.

docker-compose.yml

@@ -0,0 +1,101 @@
+version: "3.8"
+
+services:
+  # PostgreSQL - hosts both Cockatrice app data and mtgjson data
+  postgres:
+    image: postgres:16-alpine
+    container_name: mtg_postgres
+    restart: unless-stopped
+    environment:
+      POSTGRES_USER: ${POSTGRES_USER:-cockatrice}
+      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:-cockatrice_pass}
+      POSTGRES_DB: ${POSTGRES_DB:-cockatrice}
+      POSTGRES_INITDB_ARGS: "--encoding=UTF8 --lc-collate=C --lc-ctype=C"
+    ports:
+      - "${POSTGRES_PORT:-5432}:5432"
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+      - ./scripts/init-db.sql:/docker-entrypoint-initdb.d/01-init.sql
+    networks:
+      - mtg_network
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U ${POSTGRES_USER:-cockatrice}"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+      start_period: 30s
+
+  # Backend API
+  backend:
+    build:
+      context: ./backend
+      dockerfile: Dockerfile
+    container_name: mtg_backend
+    restart: unless-stopped
+    depends_on:
+      postgres:
+        condition: service_healthy
+    environment:
+      - DATABASE_URL=${DATABASE_URL:-postgresql+asyncpg://cockatrice:cockatrice_pass@postgres:5432/cockatrice}
+      - MTG_DATABASE_URL=${MTG_DATABASE_URL:-postgresql+asyncpg://cockatrice:cockatrice_pass@postgres:5432/mtgdata}
+      - JWT_SECRET_KEY=${JWT_SECRET_KEY:-change-me-in-production}
+      - JWT_ALGORITHM=${JWT_ALGORITHM:-HS256}
+      - ACCESS_TOKEN_EXPIRE_MINUTES=${ACCESS_TOKEN_EXPIRE_MINUTES:-60}
+      - REFRESH_TOKEN_EXPIRE_DAYS=${REFRESH_TOKEN_EXPIRE_DAYS:-7}
+      - CORS_ORIGINS=${CORS_ORIGINS:-["http://localhost:3000","http://localhost:8000"]}
+      - APP_NAME=${APP_NAME:-Cockatrice Web}
+      - APP_VERSION=${APP_VERSION:-0.2.0}
+      - DEBUG=${DEBUG:-False}
+      - MTG_REFRESH_INTERVAL_DAYS=${MTG_REFRESH_INTERVAL_DAYS:-7}
+      - DATA_DIR=${DATA_DIR:-/app/data}
+      - UPLOAD_DIR=${UPLOAD_DIR:-/app/uploads}
+      - LOG_LEVEL=${LOG_LEVEL:-INFO}
+    ports:
+      - "${BACKEND_PORT:-8000}:8000"
+    volumes:
+      - mtg_data:/app/data
+      - mtg_uploads:/app/uploads
+      - mtg_logs:/app/logs
+    networks:
+      - mtg_network
+    healthcheck:
+      test: ["CMD-SHELL", "curl -f http://localhost:8000/health || exit 1"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 40s
+
+  # Weekly database refresh (runs on a schedule)
+  mtg-refresh:
+    build:
+      context: ./backend
+      dockerfile: Dockerfile
+    container_name: mtg_refresh
+    restart: "no"
+    depends_on:
+      postgres:
+        condition: service_healthy
+    environment:
+      - DATABASE_URL=${DATABASE_URL:-postgresql+asyncpg://cockatrice:cockatrice_pass@postgres:5432/cockatrice}
+      - MTG_DATABASE_URL=${MTG_DATABASE_URL:-postgresql+asyncpg://cockatrice:cockatrice_pass@postgres:5432/mtgdata}
+      - DATA_DIR=${DATA_DIR:-/app/data}
+      - MTG_REFRESH_INTERVAL_DAYS=${MTG_REFRESH_INTERVAL_DAYS:-7}
+    volumes:
+      - mtg_data:/app/data
+    command: ["python", "-m", "app.scripts.refresh_mtg"]
+    networks:
+      - mtg_network
+
+volumes:
+  postgres_data:
+    driver: local
+  mtg_data:
+    driver: local
+  mtg_uploads:
+    driver: local
+  mtg_logs:
+    driver: local
+
+networks:
+  mtg_network:
+    driver: bridge