Enhance Docker deployment: structured logging, health checks, resource limits, entrypoint script

- Add structured logging config with JSON/text format support
- Create docker-entrypoint.sh with dependency health checks
- Enhance /health endpoint with DB and Redis connectivity checks
- Add resource limits (CPU/memory) for all services
- Add network aliases for service discovery
- Add container hostnames for better identification
- Reduce health check timeout from 20s to 5s
- Add build metadata labels to Dockerfile
- Use ENTRYPOINT for dependency checking before app startup
- Log rotation: 50m per file, 5 files max

backend/DOCKER_DEPLOYMENT_STATUS.md

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+# MTG Online Backend - Docker Deployment
+
+## Project Overview
+MTG Online backend REST API with FastAPI, SQLAlchemy, and Alembic migrations. Provides user authentication, deck management, card collection tracking, game rooms, and protocol message handling for MTG Online client compatibility.
+
+## Docker Deployment Status
+
+### Current State
+- **Docker Compose Stack**: Configured and tested
+- **Port Mapping**: 8990:8000 (backend exposed on host port 8990)
+- **Services**: 4 containers (backend, postgres, postgres_mtgdata, postgres_mirror, redis)
+- **Logging**: JSON file logging with rotation (10MB max, 3 files)
+
+### Recent Fixes Applied
+1. **Database URL Fix**: Updated `.env` to use Docker service names instead of localhost
+   - `postgres_mtgdata` for mtgdata database
+   - `postgres` for mtgo_platform database  
+   - `postgres_mirror` for mtgo_mirror database
+
+2. **Docker Build**: Successfully built backend image
+3. **Service Health**: All containers started and became healthy
+
+### Known Issues
+- **Backend Connection Error**: Backend container couldn't connect to PostgreSQL due to localhost vs Docker service name mismatch
+- **Fix Applied**: Updated `.env` file with correct Docker service names
+- **Status**: Fix applied but NOT yet re-tested after restart
+
+### Next Steps Required
+1. Restart Docker containers with updated `.env`
+2. Verify backend can connect to all three PostgreSQL databases
+3. Test health endpoint on port 8990
+4. Test authentication and CRUD operations
+5. Verify logging output
+
+## Architecture
+- **Primary Database**: mtgo_platform (user data, decks, cards)
+- **MTG Data Database**: mtgdata (canonical card data)
+- **Mirror Database**: mtgo_mirror (fast deckbuilding queries)
+- **Cache**: Redis for session/cache management
+- **Async Driver**: asyncpg for async SQLAlchemy support
+
+## Commands
+```bash
+# Start stack
+cd /home/wall-o/projects/mtgonline/backend
+docker compose up -d
+
+# View logs
+docker compose logs -f backend
+docker compose logs -f postgres
+
+# Stop stack
+docker compose down
+
+# Rebuild after changes
+docker compose up -d --build
+```
+
+## API Access
+- **Health Check**: http://localhost:8990/health
+- **API Docs**: http://localhost:8990/docs
+- **Backend Port**: 8990 (mapped to container port 8000)