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/i18n/messages/en-US.ts

@@ -1494,10 +1494,20 @@ const enUS = {
       competitorLines: 'Product lines',
       competitorLinesHint: 'Separate multiple product lines with commas.',
     },
+    order: {
+      eyebrow: 'Display Order',
+      title: 'Company display order',
+      adjust: 'Adjust order',
+      done: 'Done',
+      dragHandle: 'Drag to reorder',
+      moveUp: 'Move up',
+      moveDown: 'Move down',
+    },
     messages: {
       createBrand: 'Brand created.',
       updateBrand: 'Brand updated.',
       deleteBrand: 'Brand deleted.',
+      reorderBrand: 'Company display order updated.',
       createKeyword: 'Keyword created.',
       updateKeyword: 'Keyword updated.',
       deleteKeyword: 'Keyword deleted.',

apps/admin-web/src/i18n/messages/zh-CN.ts

@@ -1430,10 +1430,20 @@ const zhCN = {
       competitorLines: '重点产品线',
       competitorLinesHint: '使用英文逗号分隔多个产品线',
     },
+    order: {
+      eyebrow: '排序',
+      title: '公司展示顺序',
+      adjust: '调整排序',
+      done: '完成',
+      dragHandle: '拖动排序',
+      moveUp: '上移',
+      moveDown: '下移',
+    },
     messages: {
       createBrand: '品牌已创建',
       updateBrand: '品牌已更新',
       deleteBrand: '品牌已删除',
+      reorderBrand: '公司展示顺序已更新',
       createKeyword: '关键词已创建',
       updateKeyword: '关键词已更新',
       deleteKeyword: '关键词已删除',