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/remote-host/environment-provisioning-technical-design.md

@@ -29,7 +29,7 @@ bootstrap 能力元数据。公开直连能力仍须完成本文末尾 GitHub/
 - 大文件传输发生在项目切换时会阻塞导航，也把 Host 级故障误显示成项目故障。
 - Host Key、认证、平台和架构本来就在新增 Host 时验证，此时继续只读探测并在 Host 卡片
   提供手动准备入口最容易理解。
-- 项目只保存 Host ID、远端路径、Runtime 选择和默认工作模式。Agent installation、
+- 项目只保存 Host ID、远端路径和 Runtime 选择。Agent installation、
   Runtime digest、Workspace identity 和 Host revision 都从当次连接取得，不写入项目；
   “移出安装”不等于“跳过当前环境检查”。
 
@@ -237,8 +237,7 @@ cleanup 失败不回滚环境，也不阻塞下一次更新。
   已完成本地验证的 Host 可选；浏览目录或保存时才连接所选 Host，并由保存流程完整检查
   Agent、Workspace 和 Runtime，但不隐式安装。
 - 项目保存验证 Host 当前 revision 与 Host Key generation、当前 Agent、Workspace、
-  Runtime、模型 profile 和 Ask/Execute 配置；SQLite 事务只写入 Host ID、规范远端路径、
-  Runtime 选择和默认工作模式。
+  Runtime 和模型 profile；SQLite 事务只写入 Host ID、规范远端路径和 Runtime 选择。
 - 打开或切换已有项目只提交本地项目选择，不执行 SSH、registry、Workspace 或 Runtime
   检查。首次实际使用远程 Workspace 或 Runtime 时才解析 Host 管理的当前 Agent/Runtime，
   并建立或复用当前 Agent 连接。已安装 Agent 暂未运行时，