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/chat_view.py

@@ -396,6 +396,24 @@ class ChatView:
             )
             self.settings_btn.pack(side=tk.RIGHT, padx=(5, 0))
         
+        # 隐私设置按钮（将在外部设置回调）
+        self.on_show_privacy = None
+        self.privacy_btn = tk.Button(
+            btn_container,
+            text="🔒 隐私",
+            font=('Microsoft YaHei UI', 10),
+            bg='#424242',
+            fg='#a5d6a7',
+            activebackground='#616161',
+            activeforeground='#a5d6a7',
+            relief=tk.FLAT,
+            padx=10,
+            pady=3,
+            cursor='hand2',
+            command=lambda: self.on_show_privacy() if self.on_show_privacy else None
+        )
+        self.privacy_btn.pack(side=tk.RIGHT, padx=(5, 0))
+        
         # 历史记录按钮
         if self.on_show_history:
             self.history_btn = tk.Button(