fix: route Scaffolder AI requests to internal litellm and fix UseCase update bug

dat-gateway/src/main/java/io/shinhanlife/dat/mcg/presentation/ScaffoldingController.java

@@ -427,10 +427,33 @@ public class ScaffoldingController {
     }
 
     private String generateAiContent(String prompt, String requestedModel) {
-        return chatClientBuilder.build().prompt()
+        String resolvedModel = resolveModel(requestedModel);
+        org.springframework.ai.chat.client.ChatClient activeChatClient;
+        org.springframework.ai.chat.prompt.ChatOptions chatOptions;
+
+        if ("Qwen3-Coder".equalsIgnoreCase(resolvedModel) || "Gemma-4-31B".equalsIgnoreCase(resolvedModel)) {
+            String liteLlmBaseUrl = "https://dev-iam-litellm.shinhanlife.co.kr:18020";
+            String apiKey = "Gemma-4-31B".equalsIgnoreCase(resolvedModel) ? "sk-EH107wYBZuU6RUTqthR17A" : "sk-UJ2IRenvaMPbY3ozQdj6zw";
+
+            org.springframework.ai.openai.api.OpenAiApi openAiApi = org.springframework.ai.openai.api.OpenAiApi.builder()
+                    .baseUrl(liteLlmBaseUrl)
+                    .apiKey(new org.springframework.ai.model.SimpleApiKey(apiKey))
+                    .build();
+
+            org.springframework.ai.openai.OpenAiChatModel dynamicChatModel = org.springframework.ai.openai.OpenAiChatModel.builder()
+                    .openAiApi(openAiApi)
+                    .build();
+
+            activeChatClient = org.springframework.ai.chat.client.ChatClient.builder(dynamicChatModel).build();
+            chatOptions = org.springframework.ai.openai.OpenAiChatOptions.builder().model(resolvedModel).build();
+        } else {
+            activeChatClient = chatClientBuilder.build();
+            chatOptions = org.springframework.ai.openai.OpenAiChatOptions.builder().model(resolvedModel).build();
+        }
+
+        return activeChatClient.prompt()
                 .user(prompt)
-                .options(org.springframework.ai.openai.OpenAiChatOptions.builder()
-                        .model(resolveModel(requestedModel)).build())
+                .options(chatOptions)
                 .call()
                 .content();
     }

dat-gateway/src/main/resources/static/admin/scaffold.html

@@ -1709,8 +1709,10 @@
         } catch (error) {
             console.warn(error);
         }
-        nameInput.value = '';
-        nameInput.readOnly = false;
+        if (!nameInput.value) {
+            nameInput.value = '';
+            nameInput.readOnly = false;
+        }
         loadUseCasesForSelection();
     }