feat(homepage): consume Zibll homepage keys on frontend queries

Point homepage getters and tab queries at home_lists / home_exclude_* /
index_list_title / list1 orderby. Support category+topics tab terms via
tax_query, expand the homepage term picker API, and keep facade method
names for existing templates without dual-writing storage keys.

assets/admin/src/pages/content/HomepageSettings.vue

@@ -295,8 +295,8 @@ async function loadCategories() {
     const res = await api.getHomepageCategories()
     const cats = res?.data || []
     categoryOptions.value = cats.map(c => ({
-      label: `${c.name} (${c.count})`,
-      value: c.term_id,
+      label: `${c.taxonomy === 'topics' ? '[专题] ' : ''}${c.name} (${c.count})`,
+      value: c.term_id || c.id,
     }))
   } catch {
     // non-critical