♻️(backend) align Application model field with is_active convention

Most models in the project use `is_active` rather than `active`.
The Application model was not aligned with this convention.

Rename the field and add a migration to standardize the naming.
Update related tests accordingly.

This change should not introduce breaking changes for external
applications.

src/backend/core/tests/test_external_api_rooms.py

@@ -904,7 +904,7 @@ def test_api_rooms_token_unknown_application(settings):
 
 def test_api_rooms_token_inactive_application(settings):
     """Token for inactive application should be rejected."""
-    application = ApplicationFactory(active=False)
+    application = ApplicationFactory(is_active=False)
 
     now = datetime.now(timezone.utc)
     payload = {

src/backend/core/tests/test_external_api_token.py

@@ -23,7 +23,7 @@ def test_api_applications_generate_token_success(settings):
     """Valid credentials should return a JWT token."""
     UserFactory(email="User.Family@example.com")
     application = ApplicationFactory(
-        active=True,
+        is_active=True,
         scopes=[ApplicationScope.ROOMS_LIST, ApplicationScope.ROOMS_CREATE],
     )
 
@@ -79,7 +79,7 @@ def test_api_applications_generate_token_invalid_client_id():
 def test_api_applications_generate_token_invalid_client_secret():
     """Invalid client_secret should return 401."""
     user = UserFactory(email="user@example.com")
-    application = ApplicationFactory(active=True)
+    application = ApplicationFactory(is_active=True)
 
     client = APIClient()
     response = client.post(
@@ -100,7 +100,7 @@ def test_api_applications_generate_token_invalid_client_secret():
 def test_api_applications_generate_token_inactive_application():
     """Inactive application should return 401."""
     user = UserFactory(email="user@example.com")
-    application = ApplicationFactory(active=False)
+    application = ApplicationFactory(is_active=False)
 
     plain_secret = "test-secret-123"
     application.client_secret = plain_secret
@@ -124,7 +124,7 @@ def test_api_applications_generate_token_inactive_application():
 
 def test_api_applications_generate_token_invalid_email_format():
     """Invalid email format should return 400."""
-    application = ApplicationFactory(active=True)
+    application = ApplicationFactory(is_active=True)
 
     plain_secret = "test-secret-123"
     application.client_secret = plain_secret
@@ -149,7 +149,7 @@ def test_api_applications_generate_token_invalid_email_format():
 def test_api_applications_generate_token_domain_not_authorized():
     """Application without domain authorization should return 403."""
     user = UserFactory(email="user@denied.com")
-    application = ApplicationFactory(active=True)
+    application = ApplicationFactory(is_active=True)
     ApplicationDomainFactory(application=application, domain="allowed.com")
 
     plain_secret = "test-secret-123"
@@ -176,7 +176,7 @@ def test_api_applications_generate_token_domain_authorized():
     """Application with domain authorization should succeed."""
     user = UserFactory(email="user@allowed.com")
     application = ApplicationFactory(
-        active=True,
+        is_active=True,
         scopes=[ApplicationScope.ROOMS_LIST],
     )
     ApplicationDomainFactory(application=application, domain="allowed.com")
@@ -203,7 +203,7 @@ def test_api_applications_generate_token_domain_authorized():
 
 def test_api_applications_generate_token_user_not_found():
     """Non-existent user should return 404."""
-    application = ApplicationFactory(active=True)
+    application = ApplicationFactory(is_active=True)
 
     plain_secret = "test-secret-123"
     application.client_secret = plain_secret
@@ -231,7 +231,7 @@ def test_api_applications_token_payload_structure(settings):
     user = UserFactory(email="user@example.com")
 
     application = ApplicationFactory(
-        active=True,
+        is_active=True,
         scopes=[ApplicationScope.ROOMS_LIST, ApplicationScope.ROOMS_CREATE],
     )
 
@@ -284,7 +284,7 @@ def test_api_applications_token_new_user(settings):
     assert len(User.objects.all()) == 0
 
     application = ApplicationFactory(
-        active=True,
+        is_active=True,
         scopes=[ApplicationScope.ROOMS_LIST, ApplicationScope.ROOMS_CREATE],
     )
 
@@ -342,7 +342,7 @@ def test_api_applications_token_existing_user(settings):
     assert len(User.objects.all()) == 1
 
     application = ApplicationFactory(
-        active=True,
+        is_active=True,
         scopes=[ApplicationScope.ROOMS_LIST, ApplicationScope.ROOMS_CREATE],
     )
 

src/backend/core/tests/test_models_applications.py

@@ -41,7 +41,7 @@ def test_models_application_name_maxlength():
 def test_models_application_active_default():
     """An application should be active by default."""
     application = Application.objects.create(name="Test App")
-    assert application.active is True
+    assert application.is_active is True
 
 
 def test_models_application_scopes_default():