feat(web): Vitest 测试基建与首批单测（#27）+ 公共格式化函数

web/src/utils/format.test.ts

@@ -0,0 +1,21 @@
+import { describe, expect, it } from 'vitest';
+import { aiClassLabel, riskLevelLabel } from './format';
+
+describe('aiClassLabel', () => {
+  it('映射 healthy/sick 为中文', () => {
+    expect(aiClassLabel('healthy')).toBe('健康');
+    expect(aiClassLabel('sick')).toBe('疑似异常');
+  });
+  it('未知类别原样返回', () => {
+    expect(aiClassLabel('unknown')).toBe('unknown');
+  });
+});
+
+describe('riskLevelLabel', () => {
+  it('映射四级风险', () => {
+    expect(riskLevelLabel('green')).toBe('绿');
+    expect(riskLevelLabel('yellow')).toBe('黄');
+    expect(riskLevelLabel('orange')).toBe('橙');
+    expect(riskLevelLabel('red')).toBe('红');
+  });
+});