feat: Integrate Stripe payment processing and enhance admin settings management

- Removed the previous demo payment system and implemented a real integration with Stripe for handling payments.
- Added new API routes for creating payment intents and handling webhooks from Stripe.
- Updated the database schema to include an Order model for storing payment details.
- Enhanced the admin page to manage pricing items, including the ability to upload 3D models.
- Introduced a settings management feature for the admin panel, allowing for dynamic key-value pairs.
- Improved the RobotModel component to support dynamic attire based on uploaded models.
- Added error handling and validation for file uploads and settings management.

prisma/schema.prisma

@@ -26,3 +26,22 @@ model Snapshot {
   imageData       String
   createdAt       DateTime @default(now())
 }
+
+model Order {
+  id                 String   @id @default(cuid())
+  paymentIntentId    String   @unique
+  amount             Int
+  currency           String   @default("aed")
+  status             String
+  customerName       String?
+  customerEmail      String?
+  customerPhone      String?
+  customerAddress    String?
+  customerCity       String?
+  customerCountry    String?
+  customerPostalCode String?
+  persona            String?
+  color              String?
+  createdAt          DateTime @default(now())
+  updatedAt          DateTime @updatedAt
+}