feat: update ADK debate tab with latest improvements

app/tabs/adk_debate_tab.py

@@ -9,9 +9,27 @@ from typing import Dict, Any, List
 project_root = Path(__file__).parent.parent.parent
 sys.path.insert(0, str(project_root))
 
-from google.adk import Agent, Runner
-from google.adk.sessions import InMemorySessionService, Session
-from google.genai import types
+try:
+    from google.adk import Agent, Runner
+    from google.adk.sessions import InMemorySessionService, Session
+    from google.genai import types
+    ADK_AVAILABLE = True
+except ImportError:
+    ADK_AVAILABLE = False
+    # 创建占位符类
+    class Agent:
+        pass
+    class Runner:
+        pass
+    class InMemorySessionService:
+        pass
+    class Session:
+        pass
+    class types:
+        class Content:
+            pass
+        class Part:
+            pass
 
 async def _get_llm_reply(runner: Runner, session: Session, prompt: str) -> str:
     """Helper function to call a Runner and get a text reply."""
@@ -113,6 +131,22 @@ async def run_adk_debate_streamlit(topic: str, participants: List[str], rounds:
 
 def render_adk_debate_tab():
     """Renders the Streamlit UI for the ADK Debate tab."""
+    
+    # 检查 ADK 是否可用
+    if not ADK_AVAILABLE:
+        st.error("🚫 Google ADK 模块未安装或不可用")
+        st.info("📦 正在安装 Google ADK，请稍候...")
+        st.info("💡 安装完成后请刷新页面")
+        
+        with st.expander("📋 安装说明"):
+            st.code("""
+# 安装 Google ADK
+pip install google-adk>=1.12.0
+
+# 或从 GitHub 安装开发版
+pip install git+https://github.com/google/adk-python.git@main
+            """)
+        return
     st.markdown("### 🏛️ 八仙论道 (ADK版 - 太上老君主持)")
     
     topic = st.text_input(