create order -> upload bill

lib/features/cart/presentation/pages/checkout_page.dart

@@ -59,6 +59,8 @@ class CheckoutPage extends HookConsumerWidget {
     // Price negotiation
     final needsNegotiation = useState<bool>(false);
 
+    final needsContract = useState(false);
+
     // Watch API provider for payment terms
     final paymentTermsListAsync = ref.watch(paymentTermsListProvider);
 
@@ -240,6 +242,40 @@ class CheckoutPage extends HookConsumerWidget {
               // Price Negotiation Section
               PriceNegotiationSection(needsNegotiation: needsNegotiation),
 
+              const SizedBox(height: AppSpacing.md),
+
+
+              Container(
+                margin: const EdgeInsets.symmetric(horizontal: AppSpacing.md),
+                padding: const EdgeInsets.symmetric(horizontal: AppSpacing.md),
+                decoration: BoxDecoration(
+                  color: const Color(0xFFFFF8E1),
+                  borderRadius: BorderRadius.circular(AppRadius.card),
+                  border: Border.all(color: const Color(0xFFFFD54F)),
+                ),
+                child: Row(
+                  children: [
+                    Checkbox(
+                      value: needsContract.value,
+                      onChanged: (value) {
+                        needsContract.value = value ?? false;
+                      },
+                      activeColor: AppColors.warning,
+                    ),
+                    const Expanded(
+                      child: Text(
+                        'Yêu cầu hợp đồng',
+                        style: TextStyle(
+                          fontSize: 15,
+                          fontWeight: FontWeight.w600,
+                          color: Color(0xFF212121),
+                        ),
+                      ),
+                    ),
+                  ],
+                ),
+              ),
+
 
               const SizedBox(height: AppSpacing.md),