Refactor code for consistency and readability

- Standardized string quotes across multiple files to use double quotes for consistency.
- Improved formatting of JSON dumps in mock data for better readability.
- Enhanced the structure of various functions and data definitions for clarity.
- Updated test cases to reflect changes in data structure and ensure accuracy.

dashboard/urls.py

@@ -1,9 +1,10 @@
 from django.urls import path
+
 from . import views
 
 urlpatterns = [
-    path('', views.index, name='index'),
-    path('api/stats/', views.api_stats),
-    path('api/audits/', views.api_audits),
-    path('api/source-status/', views.api_source_status),
-]
+    path("", views.index, name="index"),
+    path("api/stats/", views.api_stats),
+    path("api/audits/", views.api_audits),
+    path("api/source-status/", views.api_source_status),
+]