🎉 feat: initialize 宇之然AI维度 project

- uni-app Vue3 frontend with dark glassmorphism theme
- 5 AI dimensions: Origin / Development / Current / Learning / Trend
- AI Chat system prompt updated from geometry to AI
- 23 AI knowledge articles initialized in DB
- Trend API + cron job for daily news
- Product pricing (Pro ¥19.9, VIP ¥39.9)
- Pinia stores + API utilities
- AGENTS.md documentation

backend/wdkj-server/package.json

@@ -0,0 +1,45 @@
+{
+  "name": "wdkj-server",
+  "version": "1.0.0",
+  "description": "宇之然-空间探索 - 后端服务",
+  "main": "src/index.js",
+  "scripts": {
+    "start": "node src/index.js",
+    "dev": "nodemon src/index.js",
+    "test": "jest"
+  },
+  "keywords": [
+    "wechat",
+    "miniprogram",
+    "geometry",
+    "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"
+  }
+}