feat: Add support for internal LiteLLM models (Qwen3, Gemma-4)

- Add dynamic routing in ChatController for Qwen3-Coder and Gemma-4-31B
- Update scaffold.html and chat.html model selection dropdowns
- Maintain existing OpenRouter fallback via application.yml

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

@@ -81,27 +81,59 @@ public class ChatController {
                 }
             }
 
-            String selectedModel = request.getOrDefault("model", "cohere/north-mini-code:free").trim();
+            String selectedModel = request.getOrDefault("model", "Qwen3-Coder").trim();
             if (selectedModel.isEmpty()) {
-                selectedModel = "cohere/north-mini-code:free";
+                selectedModel = "Qwen3-Coder";
             }
 
-            // 1. gemini-flash-latest 선택 시 OpenRouter의 Google Gemma 4 모델로 라우팅
+            // LiteLLM 내부망 모델 매핑
             if (selectedModel.equals("gemini-flash-latest")) {
-                selectedModel = "google/gemma-4-31b-it:free";
+                selectedModel = "Gemma-4-31B";
-                log.info("[Real AI Chat] Gemini 직접 API → OpenRouter Google Gemma 4 31B 로 라우팅 전환");
+                log.info("[Real AI Chat] 화면의 Gemini 플래시 선택을 사내 Gemma-4-31B 모델로 라우팅 전환");
             }
 
-            // 2. OpenRouter 무료 모델 처리 (Spring AI 빌드된 ChatClient 및 MCP 툴 호출 완벽 지원!)
+            ChatClient activeChatClient;
-            ChatClient activeChatClient = chatClientBuilder
+            org.springframework.ai.chat.prompt.ChatOptions chatOptions;
-                    .defaultSystem("You are AX HUB Assistant, a highly capable enterprise AI agent. You must use the provided tools to answer user questions when necessary. Always answer politely in Korean.")
+
-                    .build();
+            // 2. 모델 분기 처리: 사내 모델(Qwen3/Gemma-4) vs 기존 외부 모델(OpenRouter 등)
+            if ("Qwen3-Coder".equalsIgnoreCase(selectedModel) || "Gemma-4-31B".equalsIgnoreCase(selectedModel)) {
+                // 사내 LiteLLM 환경 동적 ChatModel 생성
+                String liteLlmBaseUrl = "https://dev-iam-litellm.shinhanlife.co.kr:18020";
+                String apiKey = "Gemma-4-31B".equalsIgnoreCase(selectedModel) ? "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 = ChatClient.builder(dynamicChatModel)
+                        .defaultSystem("You are AX HUB Assistant, a highly capable enterprise AI agent. You must use the provided tools to answer user questions when necessary. Always answer politely in Korean.")
+                        .build();
+                
+                chatOptions = org.springframework.ai.openai.OpenAiChatOptions.builder()
+                        .model(selectedModel)
+                        .temperature(0.2)
+                        .maxTokens(16384)
+                        .build();
+            } else {
+                // 기존 방식: application.yml 에 설정된 기본 Bean (OpenRouter 등) 사용
+                activeChatClient = chatClientBuilder
+                        .defaultSystem("You are AX HUB Assistant, a highly capable enterprise AI agent. You must use the provided tools to answer user questions when necessary. Always answer politely in Korean.")
+                        .build();
+                
+                chatOptions = org.springframework.ai.openai.OpenAiChatOptions.builder()
+                        .model(selectedModel)
+                        .build();
+            }
 
             Flux<String> responseStream = activeChatClient.prompt()
                     .user(message)
                     .toolCallbacks(callbacks.toArray(new ToolCallback[0]))
-                    .options(org.springframework.ai.openai.OpenAiChatOptions.builder()
+                    .options(chatOptions)
-                            .model(selectedModel).build())
                     .stream()
                     .content();
 

dat-gateway/src/main/resources/application.yml

@@ -9,6 +9,7 @@ spring:
   lifecycle:
     timeout-per-shutdown-phase: 20s
   ai:
+    # 기본(외부) 모델로 사용할 OpenRouter 설정입니다.
     openai:
       api-key: ${OPENROUTER_API_KEY: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}
       base-url: https://openrouter.ai/api/v1
@@ -18,6 +19,13 @@ spring:
           model: cohere/north-mini-code:free
           temperature: 0.3
 
+# 신한라이프 다중 모델 동적 라우팅을 위한 커스텀 설정
+shinhan:
+  ai:
+    base-url: https://dev-iam-litellm.shinhanlife.co.kr:18020
+    qwen-key: sk-UJ2IRenvaMPbY3ozQdj6zw
+    gemma-key: sk-EH107wYBZuU6RUTqthR17A
+
 server:
   port: 8081
   http2:

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

@@ -953,11 +953,15 @@
                                 </div>
                                 <div class="col-md-3">
                                     <select id="aiModelSelect" class="form-select" aria-label="AI 모델 선택">
-                                        <option value="cohere/north-mini-code:free" selected>Cohere North Mini Code</option>
+                                        <optgroup label="[신한라이프 내부망]">
-                                        <option value="inclusionai/ling-3.0-flash:free">InclusionAI Ling 3 Flash</option>
+                                            <option value="Qwen3-Coder" selected>Qwen3-Coder</option>
-                                        <option value="openai/gpt-oss-20b:free">OpenAI GPT-OSS 20B</option>
+                                            <option value="Gemma-4-31B">Gemma-4-31B</option>
-                                        <option value="google/gemma-4-31b-it:free">Google Gemma 4 31B</option>
+                                        </optgroup>
-                                        <option value="nvidia/nemotron-3-nano-30b-a3b:free">NVIDIA Nemotron 3 Nano</option>
+                                        <optgroup label="[외부 OpenRouter 무료]">
+                                            <option value="cohere/north-mini-code:free">Cohere North Mini Code</option>
+                                            <option value="inclusionai/ling-3.0-flash:free">InclusionAI Ling 3 Flash</option>
+                                            <option value="openai/gpt-oss-20b:free">OpenAI GPT-OSS 20B</option>
+                                        </optgroup>
                                     </select>
                                 </div>
                                 <div class="col-md-3 d-grid">

dat-gateway/src/main/resources/static/chat.html

@@ -88,14 +88,15 @@
             </div>
             <div class="flex items-center gap-4">
                 <select id="model-select" class="bg-[#1e2128] text-slate-300 text-xs px-3 py-1.5 rounded-lg border border-white/10 focus:outline-none focus:border-emerald-500/50 cursor-pointer">
-                    <option value="Gemma-4-31B" selected>Gemma-4-31B (사내 로컬 제공)</option>
+                    <optgroup label="[신한라이프 내부망]">
-                    <option value="Qwen3-Coder">Qwen3-Coder (사내 로컬 제공)</option>
+                        <option value="Qwen3-Coder" selected>Qwen3-Coder</option>
-                    <option value="inclusionai/ling-3.0-flash:free">Ling 3.0 Flash (무료 - 외부)</option>
+                        <option value="Gemma-4-31B">Gemma-4-31B</option>
-                    <option value="openai/gpt-oss-20b:free">GPT-OSS 20B (무료 - 외부)</option>
+                    </optgroup>
-                    <option value="google/gemma-4-31b-it:free">Gemma 4 31B (무료 - 외부)</option>
+                    <optgroup label="[외부 OpenRouter 무료]">
-                    <option value="nvidia/nemotron-3-nano-30b-a3b:free">NVIDIA Nemotron Nano 30B (무료 - 외부)</option>
+                        <option value="cohere/north-mini-code:free">Cohere North Mini Code</option>
-                    <option value="cohere/north-mini-code:free">Cohere North Mini (기본 · 무료 - 외부)</option>
+                        <option value="inclusionai/ling-3.0-flash:free">Ling 3.0 Flash</option>
-                    <option value="gemini-flash-latest">Gemini 1.5 Flash (직접 API - Google)</option>
+                        <option value="openai/gpt-oss-20b:free">GPT-OSS 20B</option>
+                    </optgroup>
                 </select>
 
                 <div class="flex items-center gap-2">