feat(03-01): 在 qy_lty/urls.py 注册 /api/credential-slot/ 路由

- imports 段追加 from aiapp.views import CredentialSlotClientView
- api_urlpatterns 列表在 common/upload/ 与 v1/admin/ 之间插入新路由
  path('credential-slot/', CredentialSlotClientView.as_view(), name='client_credential_slot')
- 最终 URL: /api/credential-slot/（顶层 api_urlpatterns，非任何 sub-include）
- resolve('/api/credential-slot/') 返回 CredentialSlotClientView，反向解析返回 /api/credential-slot/
- python manage.py check 通过（仅遗留 staticfiles.W004 与本 plan 无关）

CRED-05 落地步骤 2/3

qy_lty/qy_lty/urls.py

@@ -24,6 +24,7 @@ from drf_yasg import openapi
 from rest_framework import permissions
 import logging
 from common.views import upload_file
+from aiapp.views import CredentialSlotClientView
 
 logger = logging.getLogger(__name__)
 logger.info('start at fengye urls')
@@ -55,6 +56,8 @@ api_urlpatterns = [
     path('achievement/', include('achievement_app.urls')),  # 成就系统API
     path('food/', include('food_app.urls')),  # 食物管理API
     path('common/upload/', upload_file, name='file-upload'),
+    # Phase 3 — 客户端通用凭据槽位读取接口（CRED-05，明文返回）
+    path('credential-slot/', CredentialSlotClientView.as_view(), name='client_credential_slot'),
     # 管理员API接口路径（v1版本）
     path('v1/admin/', include('userapp.admin_urls')),
 ]