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>

packages/shared-types/src/index.ts

@@ -1695,6 +1695,7 @@ export interface Brand {
   website: string | null
   description: string | null
   status: string
+  sort_order?: number
   keyword_count: number
   question_count: number
   competitor_count?: number
@@ -1702,6 +1703,10 @@ export interface Brand {
   updated_at?: string
 }
 
+export interface BrandReorderRequest {
+  brand_ids: number[]
+}
+
 export interface KeywordRequest {
   name: string
 }