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/soundStore.ts

@@ -0,0 +1,90 @@
+import { create } from 'zustand'
+import { persist } from 'zustand/middleware'
+import type { ThemeName } from '../types'
+
+type SoundEffect =
+  | 'correct'
+  | 'incorrect'
+  | 'steal'
+  | 'timer_tick'
+  | 'timer_urgent'
+  | 'victory'
+  | 'defeat'
+  | 'select'
+
+interface SoundState {
+  volume: number
+  muted: boolean
+  setVolume: (volume: number) => void
+  setMuted: (muted: boolean) => void
+  toggleMute: () => void
+}
+
+export const useSoundStore = create<SoundState>()(
+  persist(
+    (set) => ({
+      volume: 0.7,
+      muted: false,
+      setVolume: (volume) => set({ volume }),
+      setMuted: (muted) => set({ muted }),
+      toggleMute: () => set((state) => ({ muted: !state.muted })),
+    }),
+    {
+      name: 'trivia-sound',
+    }
+  )
+)
+
+// Sound file paths per theme
+export const soundPaths: Record<ThemeName, Record<SoundEffect, string>> = {
+  drrr: {
+    correct: '/sounds/drrr/correct.mp3',
+    incorrect: '/sounds/drrr/incorrect.mp3',
+    steal: '/sounds/drrr/steal.mp3',
+    timer_tick: '/sounds/drrr/tick.mp3',
+    timer_urgent: '/sounds/drrr/urgent.mp3',
+    victory: '/sounds/drrr/victory.mp3',
+    defeat: '/sounds/drrr/defeat.mp3',
+    select: '/sounds/drrr/select.mp3',
+  },
+  retro: {
+    correct: '/sounds/retro/correct.mp3',
+    incorrect: '/sounds/retro/incorrect.mp3',
+    steal: '/sounds/retro/steal.mp3',
+    timer_tick: '/sounds/retro/tick.mp3',
+    timer_urgent: '/sounds/retro/urgent.mp3',
+    victory: '/sounds/retro/victory.mp3',
+    defeat: '/sounds/retro/defeat.mp3',
+    select: '/sounds/retro/select.mp3',
+  },
+  minimal: {
+    correct: '/sounds/minimal/correct.mp3',
+    incorrect: '/sounds/minimal/incorrect.mp3',
+    steal: '/sounds/minimal/steal.mp3',
+    timer_tick: '/sounds/minimal/tick.mp3',
+    timer_urgent: '/sounds/minimal/urgent.mp3',
+    victory: '/sounds/minimal/victory.mp3',
+    defeat: '/sounds/minimal/defeat.mp3',
+    select: '/sounds/minimal/select.mp3',
+  },
+  rgb: {
+    correct: '/sounds/rgb/correct.mp3',
+    incorrect: '/sounds/rgb/incorrect.mp3',
+    steal: '/sounds/rgb/steal.mp3',
+    timer_tick: '/sounds/rgb/tick.mp3',
+    timer_urgent: '/sounds/rgb/urgent.mp3',
+    victory: '/sounds/rgb/victory.mp3',
+    defeat: '/sounds/rgb/defeat.mp3',
+    select: '/sounds/rgb/select.mp3',
+  },
+  anime: {
+    correct: '/sounds/anime/correct.mp3',
+    incorrect: '/sounds/anime/incorrect.mp3',
+    steal: '/sounds/anime/steal.mp3',
+    timer_tick: '/sounds/anime/tick.mp3',
+    timer_urgent: '/sounds/anime/urgent.mp3',
+    victory: '/sounds/anime/victory.mp3',
+    defeat: '/sounds/anime/defeat.mp3',
+    select: '/sounds/anime/select.mp3',
+  },
+}