feat(kol): add SSE streaming for prompt assist

- Extract assist runtime (prompt building, response parsing, finalize)
  from the worker into kol_assist_runtime so the sync streaming path
  and the async task path share the same logic.
- Add POST /kol/manage/assist/stream as a Server-Sent Events endpoint
  emitting start/delta/completed/error events, and wire it to a
  streamAssist helper on kolManageApi that reports ApiClientError with
  the server's error envelope.
- Stream generated content live in KolPromptEditor and KolGenerateView,
  switching KolPromptEditArea to a boolean aiBusy flag and refining the
  generator page layout.
- Add KolAssistStreamEvent to shared types.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/admin-web/src/views/WorkspaceView.vue

@@ -27,8 +27,8 @@ import ArticleSourceMeta from "@/components/ArticleSourceMeta.vue";
 import ArticleDetailDrawer from "@/components/ArticleDetailDrawer.vue";
 import PublishArticleModal from "@/components/PublishArticleModal.vue";
 import { articlesApi, workspaceApi } from "@/lib/api";
-import { getTemplateMeta } from "@/lib/display";
 import { buildArticleClipboardContent, resolveArticleActionState } from "@/lib/article-list-actions";
+import { formatDateTime, getTemplateMeta } from "@/lib/display";
 import { formatError } from "@/lib/errors";
 
 const queryClient = useQueryClient();
@@ -303,6 +303,9 @@ function refreshDashboard(): void {
             <h4 class="kol-card-title" :title="card.prompt_name">{{ card.prompt_name }}</h4>
             <div class="kol-card-meta-row">
               <span class="kol-card-prompt" :title="card.package_name">{{ card.package_name }}</span>
+              <span class="kol-card-updated-at">
+                {{ t("common.updatedAt") }}: {{ formatDateTime(card.updated_at) }}
+              </span>
             </div>
             
             <div class="kol-card-footer">
@@ -747,9 +750,9 @@ function refreshDashboard(): void {
 
 .kol-card-meta-row {
   display: flex;
+  flex-direction: column;
   align-items: flex-start;
-  flex-wrap: wrap;
-  gap: 8px;
+  gap: 6px;
   flex: 1;
 }
 
@@ -764,6 +767,12 @@ function refreshDashboard(): void {
   font-weight: 400;
 }
 
+.kol-card-updated-at {
+  font-size: 12px;
+  color: #9ca3af;
+  line-height: 1.4;
+}
+
 .kol-card-footer {
   display: flex;
   justify-content: space-between;