feat(admin): back the SPA icon picker with the server catalog

FaIconPicker drops its duplicated hard-coded FA subset and loads
GET /aksrt/v1/icons/catalog: full solid/regular/brands sets, the
built-in zibsvg sprite tab and an inline custom SVG tab. Props/emit
surface is unchanged; the system-notice title icon schema drift
(input vs icon) is fixed on the JS side.

assets/admin/src/api/modules/icons.js

@@ -0,0 +1,8 @@
+/**
+ * Icon catalog API — serves the universal icon picker (FA5 + sprite + custom).
+ */
+export const iconsApiMethods = {
+  getIconCatalog() {
+    return this.request('/icons/catalog')
+  },
+}

assets/admin/src/api/modules/index.js

@@ -6,6 +6,7 @@ import { paymentApiMethods } from './payment.js'
 import { extensionsApiMethods } from './extensions.js'
 import { toolsApiMethods } from './tools.js'
 import { schemaApiMethods } from './schema.js'
+import { iconsApiMethods } from './icons.js'
 
 export const apiMethods = {
   ...globalApiMethods,
@@ -16,4 +17,5 @@ export const apiMethods = {
   ...extensionsApiMethods,
   ...toolsApiMethods,
   ...schemaApiMethods,
+  ...iconsApiMethods,
 }