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/user-stories.md

@@ -50,7 +50,7 @@
 验收：
 
 - Given 系统 PATH 没有 Node.js
-- When 本机 Execute 请求运行普通 JavaScript SKILL
+- When 本机请求运行普通 JavaScript SKILL
 - Then `node` 使用 GoodBuddy 托管来源
 - And `npm`、`npx` 与该 Node 来源一致
 - And 设置显示实际 Node 版本
@@ -234,16 +234,16 @@
 - 候选完整诊断成功后才发布
 - 更新失败继续使用健康旧版本
 
-### US-D6 安装解释器不扩大 Ask 权限
+### US-D6 安装解释器不改变能力范围
 
-作为 Ask 用户，我希望安装 Node/Python 后仍保持原有只读边界，以免环境准备改变授权范围。
+作为用户，我希望安装 Node/Python 后仍按已启用能力运行，内部文本调用保持无工具。
 
 验收：
 
 - 工具环境不新增 Runtime 工具
-- Ask 是否允许命令仍由当前 Runtime 边界决定
-- Ask 中禁止的写入和执行不会因解释器存在而放行
-- Execute 继续使用用户已授权的本机账号权限
+- 命令可用性由当前 Runtime 的实际注册能力决定
+- 内部文本调用不因解释器存在而获得工具
+- 工具继续使用本机账号权限
 
 ## 6. Epic E：受限网络与离线行为明确