fix(admin-web): invalidate workspace cache after every AI-points-consuming call

Top-nav quota chip (会员到期 / 生成文章 / AI 点数) only refreshes when its
query is invalidated. Several mutations and stream-based flows that debit
points or article quota on the server were not invalidating it, so users
had to refresh the page to see updated balances.

- TemplateWizardView: invalidate `['workspace']` inside `endAssistTask()`,
  covering analyze / title / outline assist tasks in one place.
- FreeCreateView: invalidate after `articlesApi.create` success.
- GenerateTaskDrawer: add `['workspace']` to the instant-generate
  `Promise.all` alongside the existing `articles` / `instantTasks` keys.
- KolPromptEditor: invalidate in the `finally` of both `runAiAssistStream`
  (generate) and `generateSelectionAiPreview` (optimize) so abort / error
  paths also refresh.
- ArticleEditorCanvas: bring in `useQueryClient` and invalidate in the
  selection-optimize stream `finally`.

Together with the existing invalidations in TemplateWizard.generate,
ImitationGenerate, KolGenerate, and article-regenerate, every quota-
debiting call site now feeds the cache refresh.

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

apps/admin-web/src/components/GenerateTaskDrawer.vue

@@ -173,6 +173,7 @@ const instantGenerateMutation = useMutation({
     await Promise.all([
       queryClient.invalidateQueries({ queryKey: ['articles'] }),
       queryClient.invalidateQueries({ queryKey: ['instantTasks'] }),
+      queryClient.invalidateQueries({ queryKey: ['workspace'] }),
     ])
   },
   onError: (error) => message.error(formatError(error)),