refactor: 项目架构重构 - 目录标准化 + 清理冗余

- 目录重命名: backend/wdkj-server/ → server/, frontend/ai-dimension/ → client/
- 删除 20+ 冗余文件（WDKJ 旧脚本、Windows 脚本、过时文档、设计稿）
- 更新 package.json 元数据（移除 wdkj 命名）
- 完善三级 .gitignore（根 + server + client）
- 重写 README.md 和 CHANGELOG.md
- 工具脚本移至 scripts/

client/package.json

@@ -0,0 +1,30 @@
+{
+  "name": "ai-dimension",
+  "version": "1.0.0",
+  "description": "宇之然AI维度 - 微信小程序",
+  "private": true,
+  "scripts": {
+    "dev:mp-weixin": "uni -p mp-weixin",
+    "build:mp-weixin": "uni build -p mp-weixin",
+    "dev:h5": "uni",
+    "build:h5": "uni build"
+  },
+  "dependencies": {
+    "@dcloudio/uni-app": "3.0.0-4060620250520001",
+    "@dcloudio/uni-components": "3.0.0-4060620250520001",
+    "@dcloudio/uni-h5": "3.0.0-4060620250520001",
+    "@dcloudio/uni-mp-weixin": "3.0.0-4060620250520001",
+    "pinia": "^2.1.7",
+    "vue": "^3.4.21"
+  },
+  "devDependencies": {
+    "@dcloudio/types": "^3.4.8",
+    "@dcloudio/uni-automator": "3.0.0-4060620250520001",
+    "@dcloudio/uni-cli-shared": "3.0.0-4060620250520001",
+    "@dcloudio/vite-plugin-uni": "3.0.0-4060620250520001",
+    "@vitejs/plugin-vue": "^5.0.0",
+    "sass": "^1.70.0",
+    "typescript": "^5.3.0",
+    "vite": "^5.2.0"
+  }
+}