add fcs shipment in processing,update cargo types for carton

lib/pages/customer/model/customer_model.dart

@@ -37,7 +37,8 @@ class CustomerModel extends BaseModel {
         rowPerLoad: 30);
   }
 
-  Future<User> getUser(String? id) async {
+  Future<User?> getUser(String? id) async {
+    if (id == null) return null;
     String path = "/$user_collection";
     var snap = await FirebaseFirestore.instance.collection(path).doc(id).get();
     return User.fromMap(snap.data() as Map<String, dynamic>, snap.id);
@@ -76,4 +77,20 @@ class CustomerModel extends BaseModel {
   Future<void> acceptRequest(String userID) {
     return Services.instance.userService.acceptRequest(userID);
   }
+
+  Future<User?> getUserByFCSId(String? fcsID) async {
+    if (fcsID == null) return null;
+    String path = "/$user_collection";
+    var snap = await FirebaseFirestore.instance
+        .collection(path)
+        .where('fcs_id', isEqualTo: fcsID)
+        .limit(1)
+        .get();
+
+    if (snap.docs.isNotEmpty) {
+      return User.fromMap(snap.docs.first.data(), snap.docs.first.id);
+    } else {
+      return null;
+    }
+  }
 }