feat: 官网 + 管理端 + Gin/GORM 后端首个完整版本

- web/: 产品官网（Hero 事件流终端、功能矩阵、架构、快速开始、下载、博客 + Markdown 详情页），青瓷绿双主题
- admin/: 内容管理（JWT 登录、文章分页/搜索/CRUD、草稿与发布），embed 挂 /admin
- server/: Gin + GORM，MySQL（DSN 走 .env，SQLite 兜底）；规范落地：sundynix_ 表前缀、字符串雪花主键、snake_case 列名、统一响应信封、公共分页参数
- 双 SPA embed 单二进制部署，make build 一键出包

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

admin/package.json

@@ -0,0 +1,31 @@
+{
+  "name": "admin",
+  "private": true,
+  "version": "0.0.0",
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "tsc -b && vite build",
+    "lint": "oxlint",
+    "preview": "vite preview"
+  },
+  "dependencies": {
+    "@tailwindcss/vite": "^4.3.3",
+    "clsx": "^2.1.1",
+    "lucide-react": "^1.24.0",
+    "react": "^19.2.7",
+    "react-dom": "^19.2.7",
+    "react-router-dom": "^7.18.1",
+    "tailwind-merge": "^3.6.0",
+    "tailwindcss": "^4.3.3"
+  },
+  "devDependencies": {
+    "@types/node": "^24.13.3",
+    "@types/react": "^19.2.17",
+    "@types/react-dom": "^19.2.3",
+    "@vitejs/plugin-react": "^6.0.3",
+    "oxlint": "^1.71.0",
+    "typescript": "~6.0.2",
+    "vite": "^8.1.1"
+  }
+}