feat: unify execution and add workspace file imports

Remove Ask/Execute modes and general product tool approvals so requests use the selected runtime, enabled capabilities, and execution account permissions. Migrate retired application metadata while preserving user content.

Retire the Results page while retaining conversation images and stored artifacts. Add local and remote workspace file imports, timestamps and sorting, improve image discovery and saving, and refine workspace navigation and supervision responsiveness. Include the accompanying web-search changes, tests, probes, and product documentation.

Remote imports require an updated Agent. Existing artifacts are not automatically copied into project directories. Validation evidence and outstanding failures remain documented in feature progress files; no full test suite or real-model calls were rerun for this commit.

Release note: Run requests without switching work modes, import files into a selected local or remote workspace folder, sort workspace files by date, and keep using conversation images after removal of the Results page.

docs/features/desktop-pet/README.md

@@ -6,7 +6,7 @@ Task 和 Runtime 能力的一个轻量触发面和状态镜面。
 
 ## 核心边界
 
-- 桌面宠物**不**新增 Ask/Execute 执行通道，也不在自身窗口内直接展示模型回复。快速发起
+- 桌面宠物**不**新增工具执行通道，也不在自身窗口内直接展示模型回复。快速发起
   和拖放暂存的内容始终交给主窗口现有输入区确认后发送，从不自动发送或自动执行。
 - 桌面宠物**不**持续读取屏幕内容、剪贴板或全局选中文本。
 - 桌面宠物显示的任务状态、通知和历史记录均来自现有 Task/Conversation 数据，不建立第二套
@@ -41,7 +41,7 @@ Task 和 Runtime 能力的一个轻量触发面和状态镜面。
 - [助手工作栏](../assistant-workbar/README.md)：主窗口执行空间和输入区的权威定义，宠物的
   快速发起和拖放暂存最终落地到该输入区，不复制其行为。
 - [直连模型 Agent 能力](../direct-model-agent/README.md)、[远程主机与远程执行](../remote-host/README.md)：
-  Ask/Execute 授权边界的权威定义，宠物不扩大或绕过该边界。
+  统一执行与能力范围的权威定义，宠物不扩大或绕过该边界。
 - [文档处理](../document-processing/README.md)：拖放文件解析和格式支持的权威定义，宠物拖放
   暂存复用同一处理管线，不重新定义支持类型。
 - 根 [`UI-DESIGN.md`](../../../UI-DESIGN.md)：全局视觉、通知视口、Switch/Checkbox 语义和