Refactor test utilities and enhance ASGI settings

- Cleaned up and standardized assertions in ApiTestMixin for API response validation.
- Updated ASGI settings to use os.environ for setting the DJANGO_SETTINGS_MODULE.
- Removed unused imports and improved formatting in settings.py.
- Refactored URL patterns in urls.py for better readability and organization.
- Enhanced view functions in views.py for consistency and clarity.
- Added .flake8 configuration for linting and style enforcement.
- Introduced type stubs for django-environ to improve type checking with Pylance.

config/django/test.py

@@ -9,17 +9,17 @@ DEBUG = False
 
 # Use in-memory database for faster tests
 DATABASES = {
-    'default': {
-        'ENGINE': 'django.contrib.gis.db.backends.spatialite',
-        'NAME': ':memory:',
+    "default": {
+        "ENGINE": "django.contrib.gis.db.backends.spatialite",
+        "NAME": ":memory:",
     }
 }
 
 # Use in-memory cache for tests
 CACHES = {
-    'default': {
-        'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
-        'LOCATION': 'test-cache',
+    "default": {
+        "BACKEND": "django.core.cache.backends.locmem.LocMemCache",
+        "LOCATION": "test-cache",
     }
 }
 
@@ -37,28 +37,28 @@ class DisableMigrations:
 MIGRATION_MODULES = DisableMigrations()
 
 # Email backend for tests
-EMAIL_BACKEND = 'django.core.mail.backends.locmem.EmailBackend'
+EMAIL_BACKEND = "django.core.mail.backends.locmem.EmailBackend"
 
 # Password hashers for faster tests
 PASSWORD_HASHERS = [
-    'django.contrib.auth.hashers.MD5PasswordHasher',
+    "django.contrib.auth.hashers.MD5PasswordHasher",
 ]
 
 # Disable logging during tests
 LOGGING_CONFIG = None
 
 # Media files for tests
-MEDIA_ROOT = BASE_DIR / 'test_media'
+MEDIA_ROOT = BASE_DIR / "test_media"
 
 # Static files for tests
-STATIC_ROOT = BASE_DIR / 'test_static'
+STATIC_ROOT = BASE_DIR / "test_static"
 
 # Disable Turnstile for tests
-TURNSTILE_SITE_KEY = 'test-key'
-TURNSTILE_SECRET_KEY = 'test-secret'
+TURNSTILE_SITE_KEY = "test-key"
+TURNSTILE_SECRET_KEY = "test-secret"
 
 # Test-specific middleware (remove caching middleware)
-MIDDLEWARE = [m for m in MIDDLEWARE if 'cache' not in m.lower()]
+MIDDLEWARE = [m for m in MIDDLEWARE if "cache" not in m.lower()]
 
 # Celery settings for tests (if Celery is used)
 CELERY_TASK_ALWAYS_EAGER = True