chore(server): update config naming (#13419)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **New Features**
* Updated scenario names and options for Copilot, including new and
renamed scenarios such as "audio_transcribing,"
"complex_text_generation," "quick_decision_making,"
"quick_text_generation," and "polish_and_summarize."
* Enhanced support for customizing and overriding default model
assignments in Copilot scenarios.

* **Bug Fixes**
* Improved consistency and clarity in scenario configuration and prompt
selection.

* **Documentation**
* Updated descriptions in configuration interfaces to better explain the
ability to use custom models and override defaults.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/backend/server/src/plugins/copilot/providers/fal.ts

@@ -75,7 +75,7 @@ export class FalProvider extends CopilotProvider<FalConfig> {
 
   override readonly models = [
     {
-      id: 'lcm',
+      id: 'flux-1/schnell',
       capabilities: [
         {
           input: [ModelInputType.Text],