feat(contracts): per-cargo bulk contract templates

apps/edr-freight-web/backoffice/src/pages/ruleEngine/CargoTypesPage.tsx

@@ -54,6 +54,8 @@ interface CargoNode extends RuleEngineRecord {
   requiresDirectorApproval?: boolean;
   /** When true, bookings of this cargo type incur the flat LASHING surcharge. */
   hasLashing?: boolean;
+  /** Staff may write bulk contract templates for this cargo type (parent XOR children). */
+  hasContractTemplate?: boolean;
   /** How this cargo is measured (PER_TON / PER_ITEM); null for groups/unset. */
   unitOfMeasure?: string | null;
   /** Wagon types that can carry this bulk cargo during scheduling; empty if unset. */
@@ -111,6 +113,10 @@ const FORM_FIELDS: FormFieldDef[] = [
   // When on, every booking of this cargo type is charged the flat LASHING
   // surcharge (a rate with trigger = Lashing).
   { name: "hasLashing", label: "Charge lashing fee", type: "boolean" },
+  // Lets staff write bulk contract templates for this cargo type. The API
+  // rejects the save when the parent group (or a child) already has it on —
+  // the template must live on exactly one level.
+  { name: "hasContractTemplate", label: "Has contract template", type: "boolean" },
   { name: "isActive", label: "Active", type: "boolean" },
 ];
 
@@ -575,6 +581,13 @@ function CargoRow({
                   </Badge>
                 </Tooltip>
               ) : null}
+              {node.hasContractTemplate ? (
+                <Tooltip label="Bulk contract templates are written for this cargo type" withArrow>
+                  <Badge size="xs" variant="light" color="grape" radius="sm">
+                    Contract
+                  </Badge>
+                </Tooltip>
+              ) : null}
               {node.unitOfMeasure ? (
                 <Tooltip label="How bookings measure this cargo" withArrow>
                   <Badge size="xs" variant="light" color="teal" radius="sm">