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/local-tool-environment/technical-design.md

@@ -316,7 +316,7 @@ Renderer 不能提交 PATH、环境变量、下载 URL、摘要、安装目录
 
 ## 13. 权限与远程边界
 
-- Ask/Execute 语义不变。
+- 统一执行规则不因工具环境变化而改变。
 - 不新增解释器批准流程。
 - 不上传 shim、Python、pip 包或自定义路径。
 - 不修改 Host PATH。
@@ -350,7 +350,7 @@ Renderer 不能提交 PATH、环境变量、下载 URL、摘要、安装目录
 - Node SKILL 与 MCP。
 - Python SKILL 与 MCP。
 - 自定义解释器。
-- Ask/Execute、重建、取消和退出。
+- 无模式工具执行、内部无工具调用、重建、取消和退出。
 - 六平台打包。
 
 这些阶段是开发顺序，不是可长期发布的残缺功能。合并能力前完成普通用户和专业用户的完整