feat: add frontend types and API client for dept/region/customer stats

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

src/types.ts

@@ -109,3 +109,48 @@ export interface VehicleListItem {
   customerName: string | null;
   subjectOrg: string | null;
 }
+
+export interface ManagerStats {
+  manager: string;
+  department: string;
+  t4_5: number;
+  t4_5c: number;
+  t18: number;
+  t49: number;
+  trailer: number;
+  other: number;
+  total: number;
+}
+
+export interface DeptGroup {
+  department: string;
+  totalAssets: number;
+  operatingCount: number;
+  idleCount: number;
+  managers: ManagerStats[];
+}
+
+export interface RegionGroup {
+  region: string;
+  totalAssets: number;
+  operatingCount: number;
+  inventoryCount: number;
+  customers: string[];
+  typeBreakdown: { type: string; total: number; operating: number; inventory: number; customers: string[] }[];
+}
+
+export interface CustomerStats {
+  customer: string;
+  manager: string;
+  brand: string;
+  department: string;
+  region: string;
+  city: string;
+  t4_5: number;
+  t4_5c: number;
+  t18: number;
+  t49: number;
+  trailer: number;
+  other: number;
+  total: number;
+}