feat: 添加[随机匹配]选项到TemplateSegment匹配规则

- 在Rust后端SegmentMatchingRule枚举中添加RandomMatch变体
- 更新TypeScript前端类型定义和SegmentMatchingRuleHelper工具函数
- 修改SegmentMatchingRuleEditor组件支持随机匹配选项
- 添加绿色样式标识随机匹配规则
- 添加完整的单元测试覆盖新功能

遵循promptx/tauri-desktop-app-expert开发规范

apps/desktop/src/components/template/SegmentMatchingRuleEditor.tsx

@@ -92,6 +92,8 @@ export const SegmentMatchingRuleEditor: React.FC<SegmentMatchingRuleEditorProps>
           firstClassification.name
         ));
       }
+    } else if (ruleType === 'random') {
+      setEditingRule(SegmentMatchingRuleHelper.createRandomMatch());
     }
   };
 
@@ -106,12 +108,20 @@ export const SegmentMatchingRuleEditor: React.FC<SegmentMatchingRuleEditorProps>
   };
 
   const getCurrentRuleType = (rule: SegmentMatchingRule): string => {
-    return SegmentMatchingRuleHelper.isFixedMaterial(rule) ? 'fixed' : 'ai_classification';
+    if (SegmentMatchingRuleHelper.isFixedMaterial(rule)) {
+      return 'fixed';
+    } else if (SegmentMatchingRuleHelper.isAiClassification(rule)) {
+      return 'ai_classification';
+    } else if (SegmentMatchingRuleHelper.isRandomMatch(rule)) {
+      return 'random';
+    }
+    return 'fixed'; // 默认值
   };
 
   const ruleTypeOptions = [
     { value: 'fixed', label: '固定素材' },
     { value: 'ai_classification', label: 'AI分类素材' },
+    { value: 'random', label: '随机匹配' },
   ];
 
   const classificationOptions = aiClassifications.map(classification => ({
@@ -127,7 +137,11 @@ export const SegmentMatchingRuleEditor: React.FC<SegmentMatchingRuleEditorProps>
           <span className={`px-2 py-1 rounded text-xs ${
             SegmentMatchingRuleHelper.isFixedMaterial(currentRule)
               ? 'bg-gray-100 text-gray-800'
-              : 'bg-blue-100 text-blue-800'
+              : SegmentMatchingRuleHelper.isAiClassification(currentRule)
+              ? 'bg-blue-100 text-blue-800'
+              : SegmentMatchingRuleHelper.isRandomMatch(currentRule)
+              ? 'bg-green-100 text-green-800'
+              : 'bg-gray-100 text-gray-800'
           }`}>
             {SegmentMatchingRuleHelper.getDisplayName(currentRule)}
           </span>