fix: 修复 TUI 界面 API Key 配置和消息处理问题

1. 修复配置保存问题：config_section.py 现在正确发送 API 配置和工具限制两个消息
2. 修复代理环境变量问题：graph_client.py 自动修正缺少 scheme 前缀的代理 URL
3. 修复响应解析问题：app.py 正确从 data 字段获取 content 和 tool_calls
4. 添加操作日志更新：app.py 处理工具调用信息并更新操作日志

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ui/app.py

@@ -128,6 +128,9 @@ class GraphMemoryApp(App):
     async def _process(self, user_input: str) -> None:
         from .widgets.message_history import MessageHistory
         from .widgets.status_bar import StatusBar
+        from .widgets.right_panel import RightPanel
+        from .models.log_entry import LogEntry
+        from datetime import datetime
         
         history = self.query_one(MessageHistory)
         status_bar = self.query_one(StatusBar)
@@ -138,8 +141,29 @@ class GraphMemoryApp(App):
         )
         
         if result.get("success"):
-            content = result.get("content", "(无回复)")
+            # 响应结构: {"success": True, "data": {"content": "...", "tool_calls": [...], ...}, "error": None}
+            data = result.get("data", {})
+            content = data.get("content", "(无回复)")
             history.update_latest_message(content)
+            
+            # 处理工具调用信息，更新操作日志
+            tool_calls = data.get("tool_calls", [])
+            if tool_calls:
+                try:
+                    right_panel = self.query_one(RightPanel)
+                    operation_log = right_panel.get_operation_log()
+                    
+                    for tool_call in tool_calls:
+                        entry = LogEntry(
+                            timestamp=datetime.now(),
+                            tool_name=tool_call.get("name", "unknown"),
+                            arguments=tool_call.get("arguments", {}),
+                            result=str(tool_call.get("result", "")),
+                            duration=0.0  # 后端没有返回耗时信息
+                        )
+                        operation_log.add_log(entry)
+                except Exception:
+                    pass  # 忽略操作日志更新失败
         else:
             error = result.get("error", "未知错误")
             history.update_latest_message(f"❌ 错误: {error}")

ui/widgets/config_section.py

@@ -141,6 +141,9 @@ class ConfigSection(Vertical):
                 memory_update_max=int(memory_update.value or 10),
             )
 
+            # 先发送 API 配置更新（is_tool_limits=False）
+            self.post_message(self.ConfigChanged(self._config, is_tool_limits=False))
+            # 再发送工具限制更新（is_tool_limits=True）
             self.post_message(self.ConfigChanged(self._config, is_tool_limits=True))
         except Exception:
             pass