fix(tests): 同步 Feature test 與 provider-verification-workflow 架構變更

provider-verification-workflow (#36) 在 feature-test-coverage (#38) merge 前
已將 is_verified 欄位替換為 verification_status 狀態機，並移除 toggle-verified 路由。

- 五個 Feature test 的 makeProvider helper 改用 verification_status='approved'
  （原 is_verified 已從 provider_profiles 欄位移除，靜默忽略導致 422/404）
- AdminUserManagementTest: toggle-verified 案例改為測試新的 approve 端點
  （PUT /admin/verifications/{userId}/approve，需 pending 狀態才可核准）

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/Feature/ProviderOfferCrudTest.php

@@ -21,7 +21,7 @@ class ProviderOfferCrudTest extends TestCase
     private function makeProvider(): User
     {
         $provider = User::factory()->create(['role' => 'provider']);
-        ProviderProfile::create(['user_id' => $provider->id, 'is_verified' => true]);
+        ProviderProfile::create(['user_id' => $provider->id, 'verification_status' => 'approved']);
         return $provider;
     }