chore: minor logic simplification in byok compatibility

Author: wjiayis

internal/services/toolkit/client/completion_v2.go

@@ -57,6 +57,9 @@ func (a *AIClientV2) ChatCompletionStreamV2(ctx context.Context, callbackStream
 	openaiChatHistory := messages
 	inappChatHistory := AppChatHistory{}
 
+	// Strip model prefix if using custom provider
+	modelSlug = stripModelPrefix(modelSlug, llmProvider)
+
 	streamHandler := handler.NewStreamHandlerV2(callbackStream, conversationId, modelSlug)
 
 	streamHandler.SendInitialization()

internal/services/toolkit/client/get_conversation_title_v2.go

@@ -29,11 +29,7 @@ func (a *AIClientV2) GetConversationTitleV2(ctx context.Context, inappChatHistor
 	message := strings.Join(messages, "\n")
 	message = fmt.Sprintf("%s\nBased on above conversation, generate a short, clear, and descriptive title that summarizes the main topic or purpose of the discussion. The title should be concise, specific, and use natural language. Avoid vague or generic titles. Use abbreviation and short words if possible. Use 3-5 words if possible. Give me the title only, no other text including any other words.", message)
 
-	// Strip model prefix if using custom provider
-	modelSlug := "openai/gpt-5-nano"
-	modelSlug = stripModelPrefix(modelSlug, llmProvider)
-
-	_, resp, err := a.ChatCompletionV2(ctx, modelSlug, OpenAIChatHistory{
+	_, resp, err := a.ChatCompletionV2(ctx, "openai/gpt-5-nano", OpenAIChatHistory{
 		openai.SystemMessage("You are a helpful assistant that generates a title for a conversation."),
 		openai.UserMessage(message),
 	}, llmProvider)