Add health check endpoint and refactor integration response handling

- Introduced a new public health check endpoint at `api/ping/` to verify API responsiveness.
- Refactored integration response handling to utilize a unified success and error response format across various methods in `IntegrationSettingsViewSet`, improving consistency and clarity in API responses.
- Updated URL patterns to include the new ping endpoint and adjusted imports accordingly.

backend/igny8_core/modules/system/urls.py

@@ -3,7 +3,7 @@ URL patterns for system module.
 """
 from django.urls import path, include
 from rest_framework.routers import DefaultRouter
-from .views import AIPromptViewSet, AuthorProfileViewSet, StrategyViewSet, system_status, get_request_metrics, gitea_webhook
+from .views import AIPromptViewSet, AuthorProfileViewSet, StrategyViewSet, system_status, get_request_metrics, gitea_webhook, ping
 from .integration_views import IntegrationSettingsViewSet
 from .settings_views import (
     SystemSettingsViewSet, AccountSettingsViewSet, UserSettingsViewSet,
@@ -51,6 +51,8 @@ integration_image_gen_settings_viewset = IntegrationSettingsViewSet.as_view({
 
 urlpatterns = [
     path('', include(router.urls)),
+    # Public health check endpoint (API Standard v1.0 requirement)
+    path('ping/', ping, name='system-ping'),
     # System status endpoint
     path('status/', system_status, name='system-status'),
     # Request metrics endpoint