feat(server): scenario mapping (#13404)

fix AI-404

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

* **New Features**
* Introduced scenario-based configuration for copilot, allowing default
model assignments for various AI use cases.
  * Added a new image generation model to the available options.

* **Improvements**
* Refined copilot provider settings by removing deprecated fallback
options and standardizing base URL configuration.
* Enhanced prompt management to support scenario-driven updates and
improved configuration handling.
* Updated admin and settings interfaces to support new scenario
configurations.

* **Bug Fixes**
* Removed deprecated or unused prompts and related references across
platforms for consistency.

* **Other**
* Improved test coverage and updated test assets to reflect prompt and
scenario changes.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/backend/server/src/plugins/copilot/embedding/client.ts

@@ -2,6 +2,7 @@ import { Logger } from '@nestjs/common';
 import type { ModuleRef } from '@nestjs/core';
 
 import {
+  Config,
   CopilotPromptNotFound,
   CopilotProviderNotSupported,
 } from '../../../base';
@@ -28,6 +29,7 @@ class ProductionEmbeddingClient extends EmbeddingClient {
   private readonly logger = new Logger(ProductionEmbeddingClient.name);
 
   constructor(
+    private readonly config: Config,
     private readonly providerFactory: CopilotProviderFactory,
     private readonly prompt: PromptService
   ) {
@@ -36,7 +38,9 @@ class ProductionEmbeddingClient extends EmbeddingClient {
 
   override async configured(): Promise<boolean> {
     const embedding = await this.providerFactory.getProvider({
-      modelId: EMBEDDING_MODEL,
+      modelId: this.config.copilot?.scenarios?.enabled
+        ? this.config.copilot.scenarios.scenarios?.embedding || EMBEDDING_MODEL
+        : EMBEDDING_MODEL,
       outputType: ModelOutputType.Embedding,
     });
     const result = Boolean(embedding);
@@ -209,12 +213,13 @@ export async function getEmbeddingClient(
   if (EMBEDDING_CLIENT) {
     return EMBEDDING_CLIENT;
   }
+  const config = moduleRef.get(Config, { strict: false });
   const providerFactory = moduleRef.get(CopilotProviderFactory, {
     strict: false,
   });
   const prompt = moduleRef.get(PromptService, { strict: false });
 
-  const client = new ProductionEmbeddingClient(providerFactory, prompt);
+  const client = new ProductionEmbeddingClient(config, providerFactory, prompt);
   if (await client.configured()) {
     EMBEDDING_CLIENT = client;
   }