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/pay/service/pay_service.vue

@@ -469,8 +469,8 @@ const getServicePartsForCustomer = () => {
 
   let path = `${import.meta.env.VITE_BASE_URL}/service/parts/customer/${service.value.customer_id}`;
   axios.get(path, { headers: authHeader() })
-    .then((response: AxiosResponse<ServicePart[]>) => {
-      serviceParts.value = response.data;
+    .then((response: AxiosResponse<{ ok?: boolean; parts?: ServicePart[] }>) => {
+      serviceParts.value = response.data?.parts || response.data;
     })
     .catch((error: Error) => {
       console.error("Failed to fetch service parts:", error);
@@ -484,8 +484,8 @@ const getCreditCards = (user_id: number) => {
     method: 'get',
     url: path,
     headers: authHeader(),
-  }).then((response: AxiosResponse<CreditCard[]>) => {
-    credit_cards.value = response.data
+  }).then((response: AxiosResponse<{ ok?: boolean; cards?: CreditCard[] }>) => {
+    credit_cards.value = response.data?.cards || []
   })
 }