feat(brand): add brand sort order and drag-to-reorder

Add a sort_order column to brands with a migration, expose a
PUT /api/tenant/brands/order reorder endpoint, and wire the
admin-web BrandsView with drag-and-drop reordering plus i18n.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

apps/admin-web/src/stores/company.ts

@@ -59,8 +59,7 @@ export const useCompanyStore = defineStore('company', () => {
     loading.value = true
     try {
       const nextBrands = normalizeBrandList(await brandsApi.list())
-      brands.value = nextBrands
-      syncCurrentBrand(nextBrands)
+      setBrands(nextBrands)
       initialized.value = true
       return nextBrands
     } finally {
@@ -68,6 +67,12 @@ export const useCompanyStore = defineStore('company', () => {
     }
   }
 
+  function setBrands(value: Brand[] | null | undefined): void {
+    const nextBrands = normalizeBrandList(value)
+    brands.value = nextBrands
+    syncCurrentBrand(nextBrands)
+  }
+
   function reset(): void {
     brands.value = []
     currentBrandId.value = null
@@ -84,6 +89,7 @@ export const useCompanyStore = defineStore('company', () => {
     loading,
     initialized,
     refreshBrands,
+    setBrands,
     setCurrentBrand,
     reset,
   }