feat: add storage plan management to tenant administration

- Introduced functionality to update storage plans for tenants in the SuperAdmin interface.
- Enhanced the SuperAdminTenantController and related services to handle storage plan updates.
- Updated frontend components to include a storage plan selector in the tenant management UI.
- Added necessary DTOs and types for storage plan handling.
- Improved localization for storage plan features in both English and Chinese.

Signed-off-by: Innei <tukon479@gmail.com>

locales/dashboard/en.json

@@ -850,16 +850,20 @@
   "superadmin.tenants.prompt.delete.title": "Delete tenant",
   "superadmin.tenants.refresh.button": "Refresh list",
   "superadmin.tenants.refresh.loading": "Refreshing…",
+  "superadmin.tenants.search.placeholder": "Search tenants...",
   "superadmin.tenants.status.active": "Active",
   "superadmin.tenants.status.banned": "Banned",
   "superadmin.tenants.status.inactive": "Inactive",
   "superadmin.tenants.status.pending": "Pending",
   "superadmin.tenants.status.suspended": "Suspended",
+  "superadmin.tenants.storage-plan.default": "Default (None)",
+  "superadmin.tenants.storage-plan.placeholder": "Select storage plan",
   "superadmin.tenants.table.actions": "Actions",
   "superadmin.tenants.table.ban": "Ban",
   "superadmin.tenants.table.created": "Created",
   "superadmin.tenants.table.plan": "Plan",
   "superadmin.tenants.table.status": "Status",
+  "superadmin.tenants.table.storage-plan": "Storage Plan",
   "superadmin.tenants.table.tenant": "Tenant",
   "superadmin.tenants.table.usage": "Usage",
   "superadmin.tenants.title": "Tenant Subscription Management",
@@ -869,6 +873,8 @@
   "superadmin.tenants.toast.delete-success": "Tenant {{name}} has been deleted.",
   "superadmin.tenants.toast.plan-error": "Failed to update subscription plan.",
   "superadmin.tenants.toast.plan-success": "{{name}} switched to the {{planId}} plan.",
+  "superadmin.tenants.toast.storage-plan-error": "Failed to update storage plan",
+  "superadmin.tenants.toast.storage-plan-success": "Storage plan updated for {{name}}",
   "superadmin.tenants.toast.unban-success": "Tenant {{name}} is no longer banned.",
   "superadmin.tenants.usage.empty": "No usage events recorded yet.",
   "welcome.tenant-missing.code": "404",

locales/dashboard/zh-CN.json

@@ -842,16 +842,20 @@
   "superadmin.tenants.prompt.delete.title": "删除租户",
   "superadmin.tenants.refresh.button": "刷新列表",
   "superadmin.tenants.refresh.loading": "正在刷新…",
+  "superadmin.tenants.search.placeholder": "搜索租户...",
   "superadmin.tenants.status.active": "活跃",
   "superadmin.tenants.status.banned": "已封禁",
   "superadmin.tenants.status.inactive": "未激活",
   "superadmin.tenants.status.pending": "待处理",
   "superadmin.tenants.status.suspended": "已暂停",
+  "superadmin.tenants.storage-plan.default": "默认（无）",
+  "superadmin.tenants.storage-plan.placeholder": "选择存储计划",
   "superadmin.tenants.table.actions": "操作",
   "superadmin.tenants.table.ban": "封禁",
   "superadmin.tenants.table.created": "创建时间",
   "superadmin.tenants.table.plan": "订阅计划",
   "superadmin.tenants.table.status": "状态",
+  "superadmin.tenants.table.storage-plan": "存储计划",
   "superadmin.tenants.table.tenant": "租户",
   "superadmin.tenants.table.usage": "用量",
   "superadmin.tenants.title": "租户订阅管理",
@@ -861,6 +865,8 @@
   "superadmin.tenants.toast.delete-success": "已删除租户 {{name}}",
   "superadmin.tenants.toast.plan-error": "更新订阅失败",
   "superadmin.tenants.toast.plan-success": "已将 {{name}} 切换到 {{planId}} 计划",
+  "superadmin.tenants.toast.storage-plan-error": "更新存储计划失败",
+  "superadmin.tenants.toast.storage-plan-success": "已更新 {{name}} 的存储计划",
   "superadmin.tenants.toast.unban-success": "已解除封禁 {{name}}",
   "superadmin.tenants.usage.empty": "尚无用量记录",
   "welcome.tenant-missing.code": "404",