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/

server/package.json

@@ -0,0 +1,40 @@
+{
+  "name": "ai-dimension-server",
+  "version": "1.1.0",
+  "description": "宇之然AI维度 - 后端API服务",
+  "main": "src/index.js",
+  "scripts": {
+    "start": "node src/index.js",
+    "dev": "nodemon src/index.js",
+    "test": "jest"
+  },
+  "keywords": ["wechat", "miniprogram", "ai", "education"],
+  "author": "宇之然团队",
+  "license": "MIT",
+  "dependencies": {
+    "axios": "^1.6.2",
+    "bcryptjs": "^2.4.3",
+    "compression": "^1.7.4",
+    "cors": "^2.8.5",
+    "crypto-js": "^4.2.0",
+    "dotenv": "^16.3.1",
+    "express": "^4.18.2",
+    "express-rate-limit": "^7.1.5",
+    "express-validator": "^7.0.1",
+    "helmet": "^7.1.0",
+    "jsonwebtoken": "^9.0.2",
+    "moment": "^2.29.4",
+    "mongoose": "^8.0.3",
+    "morgan": "^1.10.0",
+    "multer": "^2.1.1",
+    "xml2js": "^0.6.2"
+  },
+  "devDependencies": {
+    "jest": "^29.7.0",
+    "nodemon": "^3.0.2",
+    "supertest": "^7.2.2"
+  },
+  "engines": {
+    "node": ">=22.0.0"
+  }
+}