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>

frontend/src/stores/gameStore.ts

@@ -0,0 +1,104 @@
+import { create } from 'zustand'
+import type { GameRoom, Player, Question, ChatMessage, Achievement } from '../types'
+
+interface GameState {
+  // Room state
+  room: GameRoom | null
+  setRoom: (room: GameRoom | null) => void
+
+  // Player info
+  playerName: string
+  setPlayerName: (name: string) => void
+
+  // Current question
+  currentQuestion: Question | null
+  setCurrentQuestion: (question: Question | null) => void
+
+  // Timer
+  timerEnd: Date | null
+  setTimerEnd: (end: Date | null) => void
+
+  // Chat messages
+  messages: ChatMessage[]
+  addMessage: (message: ChatMessage) => void
+  clearMessages: () => void
+
+  // Achievements
+  achievements: Achievement[]
+  setAchievements: (achievements: Achievement[]) => void
+  unlockAchievement: (id: number) => void
+
+  // Game stats (for achievements tracking)
+  stats: {
+    correctStreak: number
+    stealsAttempted: number
+    stealsSuccessful: number
+    categoryCorrect: Record<number, number>
+    fastAnswers: number
+    maxDeficit: number
+  }
+  updateStats: (updates: Partial<GameState['stats']>) => void
+  resetStats: () => void
+
+  // UI state
+  showStealPrompt: boolean
+  setShowStealPrompt: (show: boolean) => void
+
+  // Reset
+  resetGame: () => void
+}
+
+const initialStats = {
+  correctStreak: 0,
+  stealsAttempted: 0,
+  stealsSuccessful: 0,
+  categoryCorrect: {},
+  fastAnswers: 0,
+  maxDeficit: 0,
+}
+
+export const useGameStore = create<GameState>((set) => ({
+  room: null,
+  setRoom: (room) => set({ room }),
+
+  playerName: '',
+  setPlayerName: (playerName) => set({ playerName }),
+
+  currentQuestion: null,
+  setCurrentQuestion: (currentQuestion) => set({ currentQuestion }),
+
+  timerEnd: null,
+  setTimerEnd: (timerEnd) => set({ timerEnd }),
+
+  messages: [],
+  addMessage: (message) =>
+    set((state) => ({ messages: [...state.messages, message].slice(-100) })),
+  clearMessages: () => set({ messages: [] }),
+
+  achievements: [],
+  setAchievements: (achievements) => set({ achievements }),
+  unlockAchievement: (id) =>
+    set((state) => ({
+      achievements: state.achievements.map((a) =>
+        a.id === id ? { ...a, unlocked: true, unlockedAt: new Date().toISOString() } : a
+      ),
+    })),
+
+  stats: initialStats,
+  updateStats: (updates) =>
+    set((state) => ({ stats: { ...state.stats, ...updates } })),
+  resetStats: () => set({ stats: initialStats }),
+
+  showStealPrompt: false,
+  setShowStealPrompt: (showStealPrompt) => set({ showStealPrompt }),
+
+  resetGame: () =>
+    set({
+      room: null,
+      currentQuestion: null,
+      timerEnd: null,
+      messages: [],
+      stats: initialStats,
+      showStealPrompt: false,
+    }),
+}))