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>

packages/server/package.json

@@ -0,0 +1,44 @@
+{
+  "name": "@gala/server",
+  "version": "1.0.0",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "dev": "tsx watch src/index.ts",
+    "build": "tsup src/index.ts --format esm --target node20 --clean",
+    "start": "node dist/index.js",
+    "typecheck": "tsc --noEmit",
+    "db:generate": "prisma generate",
+    "db:migrate": "prisma migrate dev",
+    "db:push": "prisma db push",
+    "db:seed": "tsx src/scripts/seed.ts",
+    "test": "vitest",
+    "test:load": "echo 'Load tests not configured yet'"
+  },
+  "dependencies": {
+    "@gala/shared": "workspace:*",
+    "express": "^4.21.2",
+    "socket.io": "^4.8.1",
+    "@socket.io/redis-adapter": "^8.3.0",
+    "ioredis": "^5.4.2",
+    "@prisma/client": "^6.2.1",
+    "zod": "^3.24.1",
+    "cors": "^2.8.5",
+    "helmet": "^8.0.0",
+    "compression": "^1.7.5",
+    "dotenv": "^16.4.7",
+    "pino": "^9.6.0",
+    "pino-pretty": "^13.0.0",
+    "nanoid": "^5.0.9"
+  },
+  "devDependencies": {
+    "@types/express": "^5.0.0",
+    "@types/cors": "^2.8.17",
+    "@types/compression": "^1.7.5",
+    "prisma": "^6.2.1",
+    "tsx": "^4.19.2",
+    "tsup": "^8.3.5",
+    "typescript": "^5.7.3",
+    "vitest": "^2.1.8"
+  }
+}