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.

tests/fixtures/knowledge-retrieval/synthetic-bilingual-v1.json

@@ -88,11 +88,11 @@
     },
     {
       "id": "doc-runtime",
-      "title": "Runtime modes",
+      "title": "Runtime execution",
       "chunks": [
         {
           "id": "chunk-runtime-main",
-          "content": "Ask mode is read-only at the runtime boundary. Execute mode can use tools only after the configured approval check."
+          "content": "Requests use the selected Runtime and enabled capabilities. Tools run with the execution account permissions without a product work mode or general approval gate."
         }
       ]
     },
@@ -137,12 +137,12 @@
       ]
     },
     {
-      "id": "doc-approval-secondary",
-      "title": "审批记录",
+      "id": "doc-permissions-secondary",
+      "title": "执行权限",
       "chunks": [
         {
-          "id": "chunk-approval-secondary",
-          "content": "执行敏感工具前应显示审批提示，并记录本次允许的操作范围。"
+          "id": "chunk-permissions-secondary",
+          "content": "工具使用执行账户的权限，仍须遵循用户指令，并保留取消和超时控制。"
         }
       ]
     },
@@ -315,7 +315,7 @@
     {
       "id": "query-runtime-zh",
       "language": "zh-CN",
-      "query": "询问模式是否允许写入，工具何时需要审批",
+      "query": "请求使用哪个运行时，工具执行由什么权限决定",
       "noAnswer": false,
       "judgments": [
         {
@@ -323,19 +323,19 @@
           "relevance": 3,
           "spans": [
             {
-              "text": "Ask mode is read-only at the runtime boundary."
+              "text": "Requests use the selected Runtime and enabled capabilities."
             },
             {
-              "text": "Execute mode can use tools only after the configured approval check."
+              "text": "Tools run with the execution account permissions without a product work mode or general approval gate."
             }
           ]
         },
         {
-          "chunkId": "chunk-approval-secondary",
+          "chunkId": "chunk-permissions-secondary",
           "relevance": 1,
           "spans": [
             {
-              "text": "执行敏感工具前应显示审批提示"
+              "text": "工具使用执行账户的权限"
             }
           ]
         }