refactor(frontend): update test config and optimize components

- Update vitest config to use new test directory structure
- Optimize Dashboard, RoleManagement, UserManagement components
- Improve signature utility with better error handling
- Enhance component error handling and user feedback

gym-manage-web/vitest.config.ts

@@ -7,10 +7,8 @@ export default defineConfig({
   test: {
     globals: true,
     environment: 'jsdom',
-    setupFiles: ['./src/test/setup.ts'],
-    // 明确指定包含单元测试文件和角色定义测试
+    setupFiles: ['./src/__tests__/setup.ts'],
     include: [
-      'src/test/**/*.{test,spec}.{js,ts,jsx,tsx}',
       'src/__tests__/**/*.{test,spec}.{js,ts,jsx,tsx}'
     ],
     // 明确排除E2E测试文件
@@ -27,7 +25,6 @@ export default defineConfig({
       reporter: ['text', 'json', 'html', 'lcov'],
       exclude: [
         'node_modules/',
-        'src/test/',
         'src/__tests__/',
         '**/*.d.ts',
         '**/*.config.*',