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/admin.py

@@ -0,0 +1,31 @@
+from pydantic import BaseModel
+from datetime import datetime
+
+
+class AdminBase(BaseModel):
+    username: str
+
+
+class AdminCreate(AdminBase):
+    password: str
+
+
+class AdminLogin(AdminBase):
+    password: str
+
+
+class AdminResponse(AdminBase):
+    id: int
+    created_at: datetime
+
+    class Config:
+        from_attributes = True
+
+
+class Token(BaseModel):
+    access_token: str
+    token_type: str = "bearer"
+
+
+class TokenData(BaseModel):
+    username: str | None = None