Phase 5: Complete Core Game Engine implementation

- Added MTGOnlineGame, GamePlayer, GameHistory models
- Implemented full game CRUD endpoints (create, list, get, join, leave, start, end)
- Integrated WebSocket game server with database persistence
- Added Commander deck validation service (100-card min, color identity, ban list)
- Created Alembic migration 006 for new game tables
- All game endpoints now database-backed (no more stubs)

backend/app/schemas/schemas.py

@@ -142,26 +142,75 @@ class FolderResponse(BaseModel):
 class GameCreate(BaseModel):
     """Game creation request."""
     room_id: int
-    game_type: Optional[str] = None
+    game_type: str = Field("Commander", pattern="^(Commander|Standard|Modern|Pauper)$")
+    max_players: int = Field(4, ge=2, le=10)
+    is_password_protected: bool = False
     description: Optional[str] = None
-    password: Optional[str] = None
+
+
+class GameUpdate(BaseModel):
+    """Game update request."""
+    game_type: Optional[str] = Field(None, pattern="^(Commander|Standard|Modern|Pauper)$")
+    max_players: Optional[int] = Field(None, ge=2, le=10)
+    is_password_protected: Optional[bool] = None
+
+
+class GamePlayerResponse(BaseModel):
+    """Game player response."""
+    id: int
+    game_id: int
+    user_id: int
+    seat_number: Optional[int]
+    life_total: int
+    is_ready: bool
+    is_host: bool
+    joined_at: datetime
+    
+    model_config = ConfigDict(from_attributes=True)
 
 
 class GameResponse(BaseModel):
     """Game response payload."""
     id: int
     room_id: int
-    game_type: Optional[str]
-    description: Optional[str]
-    with_password: bool
+    host_id: int
+    game_type: str
+    state: str
+    is_password_protected: bool
     max_players: int
-    player_count: int
-    started: bool
-    creation_date: datetime
+    current_players: int
+    created_at: datetime
+    started_at: Optional[datetime] = None
+    finished_at: Optional[datetime] = None
+    players: List[GamePlayerResponse] = []
     
     model_config = ConfigDict(from_attributes=True)
 
 
+class GameHistoryResponse(BaseModel):
+    """Game history response."""
+    id: int
+    game_id: Optional[int] = None
+    room_id: Optional[int] = None
+    game_type: str
+    winner_id: Optional[int] = None
+    duration_seconds: Optional[int] = None
+    result_type: Optional[str] = None
+    replay_data: Optional[dict] = None
+    created_at: datetime
+    
+    model_config = ConfigDict(from_attributes=True)
+
+
+class GameJoinResponse(BaseModel):
+    """Game join/leave response."""
+    message: str
+    game_id: int
+    player_id: int
+    current_players: int
+    max_players: int
+
+
 # ===== Room Schemas =====
 
 class RoomResponse(BaseModel):