test(config): add migration tests for litellm provider

* Implement tests for migrating configuration from v1 to v2 for the litellm provider.
* Validate the structure and values of the migrated configuration.
* Ensure migration rejects newer versions of the configuration.
fix(validate): enhance AI provider validation logic
* Consolidate provider validation into a dedicated method.
* Ensure at least one provider is specified and validate its type.
* Check for required fields based on provider type.
fix(mcpserver): update tool set to use new enrichment tool
* Replace RetryMetadataTool with RetryEnrichmentTool in the ToolSet.
fix(tools): refactor tools to use embedding and metadata runners
* Update tools to utilize EmbeddingRunner and MetadataRunner instead of Provider.
* Adjust method calls to align with the new runner interfaces.

internal/mcpserver/server.go

@@ -35,7 +35,7 @@ type ToolSet struct {
 	Files         *tools.FilesTool
 	Backfill      *tools.BackfillTool
 	Reparse       *tools.ReparseMetadataTool
-	RetryMetadata *tools.RetryMetadataTool
+	RetryMetadata *tools.RetryEnrichmentTool
 	Maintenance   *tools.MaintenanceTool
 	Skills        *tools.SkillsTool
 	ChatHistory   *tools.ChatHistoryTool

internal/mcpserver/streamable_integration_test.go

@@ -126,7 +126,7 @@ func streamableTestToolSet() ToolSet {
 		Files:         new(tools.FilesTool),
 		Backfill:      new(tools.BackfillTool),
 		Reparse:       new(tools.ReparseMetadataTool),
-		RetryMetadata: new(tools.RetryMetadataTool),
+		RetryMetadata: new(tools.RetryEnrichmentTool),
 		Maintenance:   new(tools.MaintenanceTool),
 		Skills:        new(tools.SkillsTool),
 	}