feat: initialize Annual Gala Interactive System monorepo

- Set up pnpm workspace with 4 packages: shared, server, client-mobile, client-screen
- Implement Redis atomic voting with Lua scripts (HINCRBY + distributed lock)
- Add optimistic UI with IndexedDB queue for offline resilience
- Configure Socket.io with auto-reconnection (infinite retries)
- Separate mobile (Vant) and big screen (Pixi.js) dependencies

Tech stack:
- Frontend Mobile: Vue 3 + Vant + Socket.io-client
- Frontend Screen: Vue 3 + Pixi.js + GSAP
- Backend: Express + Socket.io + Redis + Prisma/MySQL

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

package.json

@@ -0,0 +1,34 @@
+{
+  "name": "company-celebration2",
+  "version": "1.0.0",
+  "private": true,
+  "packageManager": "pnpm@9.15.0",
+  "type": "module",
+  "scripts": {
+    "dev": "pnpm -r --parallel run dev",
+    "dev:mobile": "pnpm --filter @gala/client-mobile dev",
+    "dev:screen": "pnpm --filter @gala/client-screen dev",
+    "dev:server": "pnpm --filter @gala/server dev",
+    "build": "pnpm --filter @gala/shared build && pnpm -r --filter !@gala/shared run build",
+    "build:shared": "pnpm --filter @gala/shared build",
+    "lint": "eslint packages --ext .ts,.tsx,.vue",
+    "lint:fix": "eslint packages --ext .ts,.tsx,.vue --fix",
+    "format": "prettier --write \"packages/**/*.{ts,tsx,vue,json,scss}\"",
+    "typecheck": "pnpm -r run typecheck",
+    "test": "pnpm -r run test",
+    "clean": "pnpm -r exec rm -rf node_modules dist .turbo && rm -rf node_modules"
+  },
+  "devDependencies": {
+    "@typescript-eslint/eslint-plugin": "^8.19.1",
+    "@typescript-eslint/parser": "^8.19.1",
+    "eslint": "^9.18.0",
+    "eslint-config-prettier": "^9.1.0",
+    "eslint-plugin-vue": "^9.32.0",
+    "prettier": "^3.4.2",
+    "typescript": "^5.7.3"
+  },
+  "engines": {
+    "node": ">=20.0.0",
+    "pnpm": ">=9.0.0"
+  }
+}