refactor(frontend): migrate Customer domain to centralized API services

- Replaced all direct axios imports with service layer calls across 8 customer files
- Migrated core pages: home.vue, create.vue, edit.vue
- Migrated profile pages: profile.vue (1100+ lines), TankEstimation.vue
- Migrated supporting pages: ServicePlanEdit.vue, tank/edit.vue, list.vue

Services integrated:
- customerService: CRUD, descriptions, tank info, automatic status
- authService: authentication and Authorize.net account management
- paymentService: credit cards, transactions, payment authorization
- deliveryService: delivery records and automatic delivery data
- serviceService: service calls, parts, and service plans
- adminService: statistics, social comments, and reports
- queryService: dropdown data (customer types, states)

Type safety improvements:
- Updated paymentService.ts with accurate AxiosResponse types
- Fixed response unwrapping to match api.ts interceptor behavior
- Resolved all TypeScript errors in customer domain (0 errors)

Benefits:
- Consistent authentication via centralized interceptors
- Standardized error handling across all API calls
- Improved type safety with proper TypeScript interfaces
- Single source of truth for API endpoints
- Better testability through mockable services

Verified with vue-tsc --noEmit - all customer domain files pass type checking

src/pages/employee/edit.vue

@@ -281,12 +281,12 @@ export default defineComponent({
     },
     getEmployeeTypeList() {
       const path = import.meta.env.VITE_BASE_URL + "/query/employeetype";
-      axios.get(path, { withCredentials: true })
+      axios.get(path, { withCredentials: true, headers: authHeader() })
         .then((response: any) => { this.employList = response.data; });
     },
     getStatesList() {
       const path = import.meta.env.VITE_BASE_URL + "/query/states";
-      axios.get(path, { withCredentials: true })
+      axios.get(path, { withCredentials: true, headers: authHeader() })
         .then((response: any) => { this.stateList = response.data; });
     },
   },