feat: Initial project structure for WebTriviasMulti

- Backend: FastAPI + Python-SocketIO + SQLAlchemy
  - Models for categories, questions, game sessions, events
  - AI services for answer validation and question generation (Claude)
  - Room management with Redis
  - Game logic with stealing mechanics
  - Admin API for question management

- Frontend: React + Vite + TypeScript + Tailwind
  - 5 visual themes (DRRR, Retro, Minimal, RGB, Anime 90s)
  - Real-time game with Socket.IO
  - Achievement system
  - Replay functionality
  - Sound effects per theme

- Docker Compose for deployment
- Design documentation

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/app/schemas/game.py

@@ -0,0 +1,70 @@
+from pydantic import BaseModel
+from typing import Optional, List, Dict
+from datetime import datetime
+
+
+class PlayerInfo(BaseModel):
+    name: str
+    team: str  # 'A' or 'B'
+    position: int
+    socket_id: Optional[str] = None
+
+
+class RoomCreate(BaseModel):
+    player_name: str
+
+
+class RoomJoin(BaseModel):
+    room_code: str
+    player_name: str
+    team: str  # 'A' or 'B'
+
+
+class TeamState(BaseModel):
+    players: List[PlayerInfo]
+    score: int
+    current_player_index: int
+
+
+class QuestionState(BaseModel):
+    id: int
+    category_id: int
+    difficulty: int
+    points: int
+    answered: bool = False
+
+
+class GameState(BaseModel):
+    room_code: str
+    status: str  # waiting, playing, finished
+    team_a: TeamState
+    team_b: TeamState
+    current_team: Optional[str] = None
+    current_question: Optional[int] = None
+    can_steal: bool = False
+    board: Dict[int, List[QuestionState]]  # category_id -> questions
+    timer_end: Optional[datetime] = None
+
+
+class AnswerSubmit(BaseModel):
+    question_id: int
+    answer: str
+
+
+class StealAttempt(BaseModel):
+    question_id: int
+    attempt: bool  # True = try to steal, False = pass
+    answer: Optional[str] = None
+
+
+class ChatMessage(BaseModel):
+    player_name: str
+    team: str
+    message: str
+    timestamp: datetime
+
+
+class EmojiReaction(BaseModel):
+    player_name: str
+    team: str
+    emoji: str  # One of: 👏 😮 😂 🔥 💀 🎉 😭 🤔