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_MIGRATION_PLAN.md

@@ -0,0 +1,96 @@
+# MTG Online Backend - Docker Migration Plan
+
+## Overview
+Migrate from internal database to Dockerized PostgreSQL with mtgjson.com "All Printings" dataset.
+
+## Architecture
+```
+┌─────────────────────────────────────────────────────────────┐
+│                        Docker Compose                       │
+├─────────────────────────────────────────────────────────────┤
+│  ┌─────────────────────┐    ┌──────────────────────────┐   │
+│  │   Backend Container  │───▶│    PostgreSQL Container   │   │
+│  │   (FastAPI app)      │    │    (MTG Data + App DB)    │   │
+│  │                     │    │                           │   │
+│  │   - API endpoints   │    │    - cockatrice_db (app)  │   │
+│  │   - Auth system     │    │    - mtgdata_db (mtgjson) │   │
+│  │   - Weekly refresh  │    │                           │   │
+│  └─────────────────────┘    └──────────────────────────┘   │
+└─────────────────────────────────────────────────────────────┘
+```
+
+## Tasks
+
+### 1. mtgjson Dataset Analysis
+- [x] Download and examine All Printings dataset
+- [ ] Map mtgjson schema to SQLAlchemy models
+- [ ] Identify card image files (PNG/JPG)
+- [ ] Plan database schema for card data
+
+### 2. Docker Infrastructure
+- [ ] Create Dockerfile for backend
+- [ ] Create docker-compose.yml with PostgreSQL
+- [ ] Configure environment variables
+- [ ] Set up volume mounts for data persistence
+- [ ] Configure health checks
+
+### 3. Database Migration
+- [ ] Create migration script for mtgjson schema
+- [ ] Update models.py with MTG card models
+- [ ] Add multi-database support (cockatrice + mtgdata)
+- [ ] Create schema for weekly refresh
+
+### 4. Weekly Refresh Logic
+- [ ] Create refresh script to download latest mtgjson
+- [ ] Implement incremental update logic
+- [ ] Add database cleanup for unused cards
+- [ ] Schedule via cron in Docker container
+
+### 5. Card Image Support
+- [ ] Verify image files in dataset (setJSON)
+- [ ] Add image storage/CDN support
+- [ ] Create API endpoints for card images
+
+## Files to Create/Modify
+
+### Docker Files
+- `backend/Dockerfile`
+- `docker-compose.yml`
+- `backend/.dockerignore`
+
+### Database Migration
+- `backend/app/core/database_multi.py` (multi-database support)
+- `backend/scripts/refresh_mtg.py` (weekly refresh)
+- `backend/scripts/init_mtg_db.py` (initial mtgjson import)
+
+### Configuration
+- `backend/.env.example` (updated with Docker settings)
+- `backend/app/core/settings.py` (add MTG settings)
+
+### Models
+- `backend/app/models/mtg_models.py` (mtgjson card models)
+- `backend/app/models/models.py` (update for multi-DB)
+
+## Commands
+
+### Build and Run
+```bash
+cd /home/wall-o/projects/mtgonline
+docker-compose up -d
+docker-compose logs -f backend
+```
+
+### Database Refresh
+```bash
+docker-compose exec backend python -m app.scripts.refresh_mtg
+```
+
+### Check Status
+```bash
+docker-compose ps
+docker-compose logs backend
+```
+
+## Status: IN PROGRESS
+- Current step: Creating Docker infrastructure
+- Next: Download mtgjson dataset and analyze schema