feat(API): 테넌트 로고 업로드 API 추가

- POST /api/v1/tenants/logo 엔드포인트 추가
- TenantLogoUploadRequest: 이미지 유효성 검사 (jpeg, png, gif, webp, 5MB)
- TenantService.uploadLogo(): 기존 로고 삭제 후 새 로고 저장
- 저장 경로: /storage/tenants/{tenant_id}/logo_{timestamp}.{ext}

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

app/Http/Controllers/Api/V1/TenantController.php

@@ -4,6 +4,7 @@
 
 use App\Helpers\ApiResponse;
 use App\Http\Controllers\Controller;
+use App\Http\Requests\Tenant\TenantLogoUploadRequest;
 use App\Http\Requests\Tenant\TenantStoreRequest;
 use App\Http\Requests\Tenant\TenantUpdateRequest;
 use App\Services\TenantService;
@@ -54,4 +55,11 @@ public function restore(Request $request)
             return $this->service->restoreTenant($request->all());
         }, __('message.tenant.restored'));
     }
+
+    public function uploadLogo(TenantLogoUploadRequest $request)
+    {
+        return ApiResponse::handle(function () use ($request) {
+            return $this->service->uploadLogo($request->file('logo'));
+        }, __('message.tenant.logo_uploaded'));
+    }
 }