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>

web/package.json

@@ -10,13 +10,16 @@
     "preview": "vite preview"
   },
   "dependencies": {
+    "@tailwindcss/typography": "^0.5.20",
     "@tailwindcss/vite": "^4.3.3",
     "class-variance-authority": "^0.7.1",
     "clsx": "^2.1.1",
     "lucide-react": "^1.24.0",
     "react": "^19.2.7",
     "react-dom": "^19.2.7",
+    "react-markdown": "^10.1.0",
     "react-router-dom": "^7.18.1",
+    "remark-gfm": "^4.0.1",
     "tailwind-merge": "^3.6.0",
     "tailwindcss": "^4.3.3"
   },