feat: add vendor infrastructure page with PG/CH per-tenant view

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ui/src/api/vendor-hooks.ts

@@ -94,3 +94,88 @@ export function useVendorAuditLog(filters: AuditLogFilters) {
     queryFn: () => api.get(`/vendor/audit?${params.toString()}`),
   });
 }
+
+// --- Infrastructure ---
+
+export interface PostgresOverview {
+  version: string;
+  databaseSizeBytes: number;
+  activeConnections: number;
+}
+
+export interface TenantPgStats {
+  slug: string;
+  schemaSizeBytes: number;
+  tableCount: number;
+  totalRows: number;
+}
+
+export interface TableStats {
+  tableName: string;
+  rowCount: number;
+  dataSizeBytes: number;
+  indexSizeBytes: number;
+}
+
+export interface ClickHouseOverview {
+  version: string;
+  uptimeSeconds: number;
+  totalDiskBytes: number;
+  totalUncompressedBytes: number;
+  compressionRatio: number;
+  totalRows: number;
+  activeMerges: number;
+}
+
+export interface TenantChStats {
+  tenantId: string;
+  totalRows: number;
+  rowsByTable: Record<string, number>;
+}
+
+export interface ChTableStats {
+  tableName: string;
+  rowCount: number;
+}
+
+export interface InfraOverview {
+  postgres: PostgresOverview;
+  clickhouse: ClickHouseOverview;
+}
+
+export function useInfraOverview() {
+  return useQuery<InfraOverview>({
+    queryKey: ['vendor', 'infrastructure'],
+    queryFn: () => api.get('/vendor/infrastructure'),
+  });
+}
+
+export function useInfraPostgres() {
+  return useQuery<{ overview: PostgresOverview; tenants: TenantPgStats[] }>({
+    queryKey: ['vendor', 'infrastructure', 'postgres'],
+    queryFn: () => api.get('/vendor/infrastructure/postgres'),
+  });
+}
+
+export function useInfraClickHouse() {
+  return useQuery<{ overview: ClickHouseOverview; tenants: TenantChStats[] }>({
+    queryKey: ['vendor', 'infrastructure', 'clickhouse'],
+    queryFn: () => api.get('/vendor/infrastructure/clickhouse'),
+  });
+}
+
+export function useInfraPgDetail(slug: string) {
+  return useQuery<TableStats[]>({
+    queryKey: ['vendor', 'infrastructure', 'postgres', slug],
+    queryFn: () => api.get(`/vendor/infrastructure/postgres/${slug}`),
+    enabled: !!slug,
+  });
+}
+
+export function useInfraChDetail(tenantId: string) {
+  return useQuery<ChTableStats[]>({
+    queryKey: ['vendor', 'infrastructure', 'clickhouse', tenantId],
+    queryFn: () => api.get(`/vendor/infrastructure/clickhouse/${tenantId}`),
+    enabled: !!tenantId,
+  });
+}