feat: add MMGame backend and frontend source code

backend/app/models/user.py

@@ -0,0 +1,27 @@
+import uuid
+from datetime import datetime
+from sqlalchemy import String, Integer, Text, Boolean, DateTime, Enum as SAEnum
+from sqlalchemy.orm import Mapped, mapped_column
+from app.database import Base
+import enum
+
+
+class UserRole(str, enum.Enum):
+    player = "player"
+    creator = "creator"
+    admin = "admin"
+
+
+class User(Base):
+    __tablename__ = "users"
+
+    id: Mapped[str] = mapped_column(String(36), primary_key=True, default=lambda: str(uuid.uuid4()))
+    email: Mapped[str] = mapped_column(String(255), unique=True, nullable=True)
+    nickname: Mapped[str] = mapped_column(String(50), nullable=True)
+    avatar_url: Mapped[str] = mapped_column(Text, nullable=True)
+    password_hash: Mapped[str] = mapped_column(String(255), nullable=True)
+    role: Mapped[str] = mapped_column(String(20), default=UserRole.player.value)
+    is_guest: Mapped[bool] = mapped_column(Boolean, default=False)
+    game_count: Mapped[int] = mapped_column(Integer, default=0)
+    token_version: Mapped[int] = mapped_column(Integer, default=0)
+    created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow)