feat(agents, config, dashboard, i18n): add agent line provision wizard, site deletion, and site dashboard with multi-language support

Added agent line provision wizard page with permission gating, replacing redirect placeholder. Introduced site deletion API and UI with confirmation dialog in integration sites management. Added new site-scoped dashboard panel showing bet metrics, P/L trends, active players, and quick links. Enhanced chart tooltip to support custom formatters and fix indicator color

src/modules/settlement/settlement-center-shell.tsx

@@ -10,6 +10,7 @@ import { toast } from "sonner";
 import { getSettlementPeriods, type SettlementPeriodRow } from "@/api/admin-agent-settlement";
 import { getAdminIntegrationSites } from "@/api/admin-integration-sites";
 import { AdminLoadingState } from "@/components/admin/admin-loading-state";
+import { AdminNoIntegrationSiteState } from "@/components/admin/admin-no-integration-site-state";
 import { AgentBillDetail } from "@/modules/settlement/agent-bill-detail";
 import { SettlementCenterPeriodDetail } from "@/modules/settlement/settlement-center-period-detail";
 import {
@@ -284,7 +285,9 @@ export function SettlementCenterShell(): React.ReactElement {
 
   return (
     <div className="mx-auto flex w-full max-w-7xl flex-col gap-4">
-      {siteId === null ? (
+      {siteId === null && siteOptions.length === 0 && boundAgent === null ? (
+        <AdminNoIntegrationSiteState canCreate={profile?.is_super_admin === true} />
+      ) : siteId === null ? (
         <p className="text-sm text-muted-foreground">{t("empty.noSite", { defaultValue: "请选择站点。" })}</p>
       ) : !periodsReady ? (
         <AdminLoadingState />