Refactor frontend to Composition API and improve UI/UX

Major Changes:
- Migrate components from Options API to Composition API with <script setup>
- Add centralized service layer (serviceService, deliveryService, adminService)
- Implement new reusable components (EnhancedButton, EnhancedModal, StatCard, etc.)
- Add theme store for consistent theming across application
- Improve ServiceCalendar with federal holidays and better styling
- Refactor customer profile and tank estimation components
- Update all delivery and payment pages to use centralized services
- Add utility functions for formatting and validation
- Update Dockerfiles for better environment configuration
- Enhance Tailwind config with custom design tokens

UI Improvements:
- Modern, premium design with glassmorphism effects
- Improved form layouts with FloatingInput components
- Better loading states and empty states
- Enhanced modals and tables with consistent styling
- Responsive design improvements across all pages

Technical Improvements:
- Strict TypeScript types throughout
- Better error handling and validation
- Removed deprecated api.js in favor of TypeScript services
- Improved code organization and maintainability

src/pages/customer/list.vue

@@ -39,12 +39,12 @@ const customers = ref<Customer[]>([])
 // Functions
 const fetchCustomers = () => {
   adminService.money.customerListReport()
-    .then((response: any) => {
+    .then((response) => {
       if (response.data.ok) {
         customers.value = response.data.customers;
       }
     })
-    .catch((error: unknown) => {
+    .catch((error) => {
       console.error('Error fetching customer data:', error);
     });
 }