fix(scss, types): 修正打包产物

- 更新SCSS导出方式，支持引用SCSS变量系统（编译为CSS）
- 修复SCSS类名不对应问题
- 修复无types导出问题
- 修改导出路径，避免vite build覆盖其余编译产物
- 支持tree-shaking，不暴露内部路径

BREAKING CHANGES: 1.0.0->2.0.0

package.json

@@ -2,10 +2,22 @@
   "name": "knowai-ui",
   "version": "1.0.0",
   "description": "KnowAI UI组件库",
-  "main": "index.ts",
+  "main": "dist/client/knowai-ui.umd.js",
+  "module": "dist/client/knowai-ui.es.js",
+  "types": "dist/types/index.d.ts",
+  "style": "dist/index.css",
   "type": "module",
+  "exports": {
+    ".": {
+      "import": "./dist/client/knowai-ui.es.js",
+      "require": "./dist/client/knowai-ui.umd.js"
+    },
+    "./style.css": "./dist/index.css"
+  },
   "scripts": {
-    "build": "vite build",
+    "build:types": "vue-tsc --emitDeclarationOnly",
+    "build:css": "sass src/styles/index.scss dist/index.css",
+    "build": "pnpm build:types && pnpm build:css && vite build",
     "dev": "vite",
     "preview": "vite preview",
     "test": "vitest",