fix: enable Save button when changing OpenRouter provider routing

- Modified setApiConfigurationField to exclude openRouterSpecificProvider from initial sync logic
- This ensures changes to the provider routing setting properly trigger the Save button
- Fixes #6655

Author: roomote

webview-ui/src/components/settings/SettingsView.tsx

@@ -229,7 +229,9 @@ const SettingsView = forwardRef<SettingsViewRef, SettingsViewProps>(({ onDone, t
 
 				// Don't treat initial sync from undefined to a defined value as a user change
 				// This prevents the dirty state when the component initializes and auto-syncs the model ID
-				const isInitialSync = previousValue === undefined && value !== undefined
+				// Exception: openRouterSpecificProvider should always trigger change detection
+				const isInitialSync =
+					previousValue === undefined && value !== undefined && field !== "openRouterSpecificProvider"
 
 				if (!isInitialSync) {
 					setChangeDetected(true)