feat: implement pricing item model and CRUD API for pricing management

prisma/schema.prisma

@@ -46,3 +46,13 @@ model Order {
   createdAt          DateTime @default(now())
   updatedAt          DateTime @updatedAt
 }
+
+model PricingItem {
+  id        String   @id
+  label     String
+  price     Int
+  modelPath String?
+  sortOrder Int      @default(0)
+  createdAt DateTime @default(now())
+  updatedAt DateTime @updatedAt
+}

prisma/seed.ts

@@ -47,6 +47,26 @@ async function main() {
     console.log('✓ JWT secret already exists, skipping.');
   }
 
+  // Seed default pricing items (idempotent — only if table is empty)
+  const pricingCount = await prisma.pricingItem.count();
+  if (pricingCount === 0) {
+    const defaultItems = [
+      { id: 'base', label: 'G1 Robot Base', price: 250000, sortOrder: 0 },
+      { id: 'emarati-kandura', label: 'Emarati Kandura', price: 15000, sortOrder: 1 },
+      { id: 'industrial-vest', label: 'Industrial Vest', price: 8500, sortOrder: 2 },
+      { id: 'business-suit', label: 'Business Suit', price: 12000, sortOrder: 3 },
+      { id: 'custom-color', label: 'Custom Color', price: 3500, sortOrder: 4 },
+      { id: 'robot-doctor', label: 'Robot Doctor', price: 5000, sortOrder: 5 },
+      { id: 'security-guard', label: 'Security Guard', price: 5000, sortOrder: 6 },
+    ];
+    for (const item of defaultItems) {
+      await prisma.pricingItem.create({ data: item });
+    }
+    console.log(`✓ Seeded ${defaultItems.length} default pricing items.`);
+  } else {
+    console.log(`✓ ${pricingCount} pricing items already exist, skipping.`);
+  }
+
   console.log('Seeding complete!');
 }