fix: Replace examples with interactive buttons for model switching

**Problem:**
- ChatInterface examples with additional_inputs don't work properly
- Model dropdown not updating when example is clicked
- Examples were non-functional with current setup

**Solution:**
- Replace built-in examples with custom button-based UI
- Create 4 separate example buttons with emojis
- Each button updates both model dropdown and textbox
- Organized in 2 columns (English vs Korean examples)

**Example Buttons:**
English:
- 👋 Hello! How are you? → DialoGPT-small
- 😄 Tell me a joke → DialoGPT-medium

Korean:
- 🌤️ 안녕하세요! 오늘 날씨가 어때요? → Llama-2-Ko 7B
- 🤖 인공지능에 대해 간단히 설명해주세요. → KoT-Llama2-7B-Chat

**Benefits:**
- Actually works (updates both model and input)
- Better UX with clear visual separation
- Emoji indicators for context
- Clear description of functionality

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

app.py

@@ -275,14 +275,40 @@ with gr.Blocks(
             elem_classes="chatbot-input",
             show_label=False,
         ),
-        examples=[
-            ["Hello! How are you?", "microsoft/DialoGPT-small"],
-            ["Tell me a joke", "microsoft/DialoGPT-medium"],
-            ["안녕하세요! 오늘 날씨가 어때요?", "beomi/llama-2-ko-7b"],
-            ["인공지능에 대해 간단히 설명해주세요.", "kyujinpy/KoT-Llama2-7B-Chat"],
-        ],
     )
 
+    # Examples section with model switching
+    gr.Markdown("### 💡 예제 (클릭하면 모델과 메시지가 자동으로 설정됩니다)")
+
+    with gr.Row():
+        with gr.Column(scale=1):
+            gr.Markdown("**영어 예제:**")
+            example_btn_1 = gr.Button("👋 Hello! How are you?", size="sm")
+            example_btn_2 = gr.Button("😄 Tell me a joke", size="sm")
+
+        with gr.Column(scale=1):
+            gr.Markdown("**한글 예제:**")
+            example_btn_3 = gr.Button("🌤️ 안녕하세요! 오늘 날씨가 어때요?", size="sm")
+            example_btn_4 = gr.Button("🤖 인공지능에 대해 간단히 설명해주세요.", size="sm")
+
+    # Example button click handlers
+    def set_example_1():
+        return "microsoft/DialoGPT-small", "Hello! How are you?"
+
+    def set_example_2():
+        return "microsoft/DialoGPT-medium", "Tell me a joke"
+
+    def set_example_3():
+        return "beomi/llama-2-ko-7b", "안녕하세요! 오늘 날씨가 어때요?"
+
+    def set_example_4():
+        return "kyujinpy/KoT-Llama2-7B-Chat", "인공지능에 대해 간단히 설명해주세요."
+
+    example_btn_1.click(set_example_1, outputs=[model_dropdown, chatbot.textbox])
+    example_btn_2.click(set_example_2, outputs=[model_dropdown, chatbot.textbox])
+    example_btn_3.click(set_example_3, outputs=[model_dropdown, chatbot.textbox])
+    example_btn_4.click(set_example_4, outputs=[model_dropdown, chatbot.textbox])
+
     # Show warning and clear chat when model changes
     def on_model_change(new_model):
         global current_model