feat: refactor API key configuration and enhance application initialization

- Renamed `check_environment` to `check_api_key_configured` for clarity, simplifying the API key validation logic.
- Removed the blocking behavior of the API key check during application startup, allowing the app to run while providing a prompt for configuration.
- Updated `LocalAgentApp` to accept an `api_configured` parameter, enabling conditional messaging for API key setup.
- Enhanced the `SandboxRunner` to support backup management and improved execution result handling with detailed metrics.
- Integrated data governance strategies into the `HistoryManager`, ensuring compliance and improved data management.
- Added privacy settings and metrics tracking across various components to enhance user experience and application safety.

ui/settings_view.py

@@ -40,7 +40,7 @@ class SettingsView:
         self,
         parent: tk.Widget,
         env_path: Path,
-        on_save: Optional[Callable[[], None]] = None,
+        on_save: Optional[Callable[[bool], None]] = None,
         on_back: Optional[Callable[[], None]] = None
     ):
         self.parent = parent
@@ -342,10 +342,29 @@ class SettingsView:
                 # 同时更新环境变量
                 os.environ[key] = value
             
-            messagebox.showinfo("成功", "配置已保存！")
+            # 重置 LLM 客户端单例，强制使用新配置
+            from llm.client import reset_client, test_connection
+            reset_client()
+            
+            # 进行连通性测试
+            messagebox.showinfo("提示", "配置已保存，正在测试连接...")
+            success, message = test_connection(timeout=15)
+            
+            # 记录配置变更度量
+            from llm.config_metrics import get_config_metrics
+            metrics = get_config_metrics(self.env_path.parent / "workspace")
+            metrics.mark_config_changed(connection_test_success=success)
+            
+            if success:
+                messagebox.showinfo("成功", f"配置已保存并生效！\n\n{message}")
+            else:
+                messagebox.showwarning(
+                    "配置已保存", 
+                    f"配置已保存，但连接测试失败：\n\n{message}\n\n请检查配置是否正确。"
+                )
             
             if self.on_save:
-                self.on_save()
+                self.on_save(success)
                 
         except Exception as e:
             messagebox.showerror("错误", f"保存配置失败: {str(e)}")