feat(settings): patch API in-memory settings on save and add Back to ENV button

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>

app/utils/settings_sync.py

@@ -38,7 +38,9 @@ _last_seen_version: str = ""
 
 def notify_settings_updated() -> None:
     """
-    Publish a settings-updated signal by updating the Redis version key.
+    Publish a settings-updated signal by updating the Redis version key, and
+    immediately reload the in-process ``settings`` singleton so the API
+    process serves fresh values without a restart.
 
     Call this after every successful settings write so that all worker
     processes know they need to reload their in-memory configuration.
@@ -56,6 +58,19 @@ def notify_settings_updated() -> None:
     except Exception as exc:
         logger.warning(f"Could not publish settings update to Redis: {exc}")
 
+    # Reload the in-process settings singleton immediately so the API node
+    # returns updated values (e.g. oauth_provider_name on the login page)
+    # without needing a restart.  Workers use the task_prerun signal handler
+    # instead, so this only affects the API/web process.
+    try:
+        from app.config import settings
+        from app.utils.config_loader import reload_settings_from_db
+
+        reload_settings_from_db(settings)
+        logger.debug("In-process settings reloaded after settings update")
+    except Exception as exc:
+        logger.warning(f"Could not reload in-process settings: {exc}")
+
 
 def register_settings_reload_signal() -> None:
     """