🔥(backend) remove settings AI_STREAM

We don't need anymore the AI_STREAM settings, we use the stream all the
time.

src/backend/core/api/viewsets.py

@@ -2572,7 +2572,6 @@ class ConfigView(drf.views.APIView):
         array_settings = [
             "AI_BOT",
             "AI_FEATURE_ENABLED",
-            "AI_STREAM",
             "API_USERS_SEARCH_QUERY_MIN_LENGTH",
             "COLLABORATION_WS_URL",
             "COLLABORATION_WS_NOT_CONNECTED_READY_ONLY",

src/backend/core/tests/test_api_config.py

@@ -21,7 +21,6 @@ pytestmark = pytest.mark.django_db
 @override_settings(
     AI_BOT={"name": "Test Bot", "color": "#000000"},
     AI_FEATURE_ENABLED=False,
-    AI_STREAM=True,
     API_USERS_SEARCH_QUERY_MIN_LENGTH=6,
     COLLABORATION_WS_URL="http://testcollab/",
     COLLABORATION_WS_NOT_CONNECTED_READY_ONLY=True,
@@ -48,7 +47,6 @@ def test_api_config(is_authenticated):
     assert response.json() == {
         "AI_BOT": {"name": "Test Bot", "color": "#000000"},
         "AI_FEATURE_ENABLED": False,
-        "AI_STREAM": True,
         "API_USERS_SEARCH_QUERY_MIN_LENGTH": 6,
         "COLLABORATION_WS_URL": "http://testcollab/",
         "COLLABORATION_WS_NOT_CONNECTED_READY_ONLY": True,

src/backend/impress/settings.py

@@ -714,9 +714,6 @@ class Base(Configuration):
         default=False, environ_name="AI_FEATURE_ENABLED", environ_prefix=None
     )
     AI_MODEL = values.Value(None, environ_name="AI_MODEL", environ_prefix=None)
-    AI_STREAM = values.BooleanValue(
-        default=True, environ_name="AI_STREAM", environ_prefix=None
-    )
     AI_VERCEL_SDK_VERSION = values.IntegerValue(
         6, environ_name="AI_VERCEL_SDK_VERSION", environ_prefix=None
     )