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/client-mobile/src/views/VoteCategoryView.vue

@@ -0,0 +1,23 @@
+<script setup lang="ts">
+// Placeholder view
+</script>
+
+<template>
+  <div class="vote-category-view safe-area-top safe-area-bottom">
+    <van-nav-bar title="投票" left-arrow @click-left="$router.back()" />
+    <div class="content">
+      <van-empty description="候选人列表加载中..." />
+    </div>
+  </div>
+</template>
+
+<style lang="scss" scoped>
+.vote-category-view {
+  min-height: 100vh;
+  background: #f5f5f5;
+}
+
+.content {
+  padding: 16px;
+}
+</style>