feat: implement user data schema and API endpoints

- Add Alembic migration setup with async configuration
- Create 16 user data models (users, decks, cards, replays, etc.)
- Implement comprehensive API endpoints with JWT auth
- Add replay, card collection, group, network, preferences, and activity log routers
- Include API documentation and migration test plan
- Update Dockerfile to run migrations on startup

backend/scripts/run_migrations.sh

@@ -0,0 +1,32 @@
+#!/bin/bash
+# Run Alembic migrations with database connectivity check
+
+set -e
+
+echo "Running Alembic migrations..."
+
+# Check if database is reachable
+echo "Checking database connectivity..."
+until python -c "
+import asyncio
+from sqlalchemy.ext.asyncio import create_async_engine
+
+async def check():
+    engine = create_async_engine('postgresql+asyncpg://mtgonline_user:mtgonline_password@postgres:5432/mtgonline')
+    async with engine.connect() as conn:
+        await conn.execute(sqlalchemy.text('SELECT 1'))
+    await engine.dispose()
+    print('Database connection successful')
+
+import sqlalchemy
+asyncio.run(check())
+" 2>/dev/null; do
+    echo "Waiting for database to be ready..."
+    sleep 2
+done
+
+# Run migrations
+echo "Applying migrations..."
+alembic upgrade head
+
+echo "Migrations completed successfully!"