feat(templates): migrate cloud template dialog to hub list/detail API

Replace static index.json template loading on cloud with the hub
workflows API (GET /api/hub/workflows for listing, GET
/api/hub/workflows/{share_id} for workflow JSON).

- Add listHubWorkflows, listAllHubWorkflows, getHubWorkflowDetail to api.ts
- Create adapter to convert HubWorkflowSummary to TemplateInfo
- Branch on isCloud in workflowTemplatesStore.fetchCoreTemplates()
- Update thumbnail URL resolution for absolute hub URLs
- Update workflow JSON loading to use detail API via shareId
- Add shareId-based fallback in URL template loader

src/platform/workflow/templates/composables/useTemplateUrlLoader.ts

@@ -2,9 +2,11 @@ import { useToast } from 'primevue/usetoast'
 import { useI18n } from 'vue-i18n'
 import { useRoute, useRouter } from 'vue-router'
 
+import { isCloud } from '@/platform/distribution/types'
 import { clearPreservedQuery } from '@/platform/navigation/preservedQueryManager'
 import { PRESERVED_QUERY_NAMESPACES } from '@/platform/navigation/preservedQueryNamespaces'
 import { useTelemetry } from '@/platform/telemetry'
+import { useWorkflowTemplatesStore } from '@/platform/workflow/templates/repositories/workflowTemplatesStore'
 // eslint-disable-next-line import-x/no-restricted-paths
 import { useCanvasStore } from '@/renderer/core/canvas/canvasStore'
 
@@ -108,11 +110,23 @@ export function useTemplateUrlLoader() {
     try {
       await templateWorkflows.loadTemplates()
 
-      const success = await templateWorkflows.loadWorkflowTemplate(
+      let success = await templateWorkflows.loadWorkflowTemplate(
         templateParam,
         sourceParam
       )
 
+      // On cloud, if name-based lookup fails, try by shareId (hub templates)
+      if (!success && isCloud) {
+        const store = useWorkflowTemplatesStore()
+        const templateByShareId = store.getTemplateByShareId(templateParam)
+        if (templateByShareId) {
+          success = await templateWorkflows.loadWorkflowTemplate(
+            templateByShareId.name,
+            templateByShareId.sourceModule
+          )
+        }
+      }
+
       if (!success) {
         toast.add({
           severity: 'error',