chore: 集成设计系统和完善范式相关组件

## 主要改进
- index.html：引入设计系统样式文件
- package.json：添加 playwright 依赖用于测试
- ParadigmSelectorModal.vue：添加"新建范式"按钮
- 其他组件：更新以支持自定义范式功能

## 技术改进
- 统一设计 token 和组件样式
- 完善范式选择和创建流程

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

package-lock.json

@@ -24,6 +24,7 @@
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         "dotenv": "^16.3.1",
+        "playwright": "^1.57.0",
         "vite": "^5.0.0"
       }
     },
@@ -2079,6 +2080,53 @@
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       }
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+    "node_modules/playwright": {
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+      "resolved": "https://registry.npmjs.org/playwright/-/playwright-1.57.0.tgz",
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+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "playwright-core": "1.57.0"
+      },
+      "bin": {
+        "playwright": "cli.js"
+      },
+      "engines": {
+        "node": ">=18"
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+      "optionalDependencies": {
+        "fsevents": "2.3.2"
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+      "resolved": "https://registry.npmjs.org/playwright-core/-/playwright-core-1.57.0.tgz",
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+      "dev": true,
+      "license": "Apache-2.0",
+      "bin": {
+        "playwright-core": "cli.js"
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+      "engines": {
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+      "dev": true,
+      "hasInstallScript": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "darwin"
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+      "engines": {
+        "node": "^8.16.0 || ^10.6.0 || >=11.0.0"
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     "node_modules/postcss": {
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