feat: add MMGame backend and frontend source code

backend/app/database.py

@@ -0,0 +1,24 @@
+from sqlalchemy.ext.asyncio import AsyncSession, create_async_engine, async_sessionmaker
+from sqlalchemy.orm import DeclarativeBase
+from app.config import settings
+
+engine = create_async_engine(settings.DATABASE_URL, echo=False)
+async_session = async_sessionmaker(engine, class_=AsyncSession, expire_on_commit=False)
+
+
+class Base(DeclarativeBase):
+    pass
+
+
+async def get_db():
+    async with async_session() as session:
+        try:
+            yield session
+        finally:
+            await session.close()
+
+
+async def init_db():
+    async with engine.begin() as conn:
+        from app.models import user, script, game  # noqa
+        await conn.run_sync(Base.metadata.create_all)