create submission

lib/core/constants/api_constants.dart

@@ -289,6 +289,25 @@ class ApiConstants {
   static const String getProjectList =
       '/building_material.building_material.api.project.get_list';
 
+  /// Save (create/update) project submission
+  /// POST /api/method/building_material.building_material.api.project.save
+  /// Body: {
+  ///   "name": "...",  // optional for new, required for update
+  ///   "designed_area": "Project Name",
+  ///   "address_of_project": "...",
+  ///   "project_owner": "...",
+  ///   "design_firm": "...",
+  ///   "contruction_contractor": "...",
+  ///   "design_area": 350.5,
+  ///   "products_included_in_the_design": "...",
+  ///   "project_progress": "progress_id",  // from ProjectProgress.id
+  ///   "expected_commencement_date": "2026-01-15",
+  ///   "description": "...",
+  ///   "request_date": "2025-11-26 09:30:00"
+  /// }
+  static const String saveProject =
+      '/building_material.building_material.api.project.save';
+
   /// Create new project (legacy endpoint - may be deprecated)
   /// POST /projects
   static const String createProject = '/projects';

lib/core/constants/storage_constants.dart

@@ -67,6 +67,9 @@ class HiveBoxNames {
   /// Project status list cache
   static const String projectStatusBox = 'project_status_box';
 
+  /// Project progress list cache (construction stages)
+  static const String projectProgressBox = 'project_progress_box';
+
   /// Get all box names for initialization
   static List<String> get allBoxes => [
     userBox,
@@ -81,6 +84,7 @@ class HiveBoxNames {
     wardBox,
     orderStatusBox,
     projectStatusBox,
+    projectProgressBox,
     settingsBox,
     cacheBox,
     syncStateBox,
@@ -144,6 +148,7 @@ class HiveTypeIds {
   static const int wardModel = 32;
   static const int orderStatusModel = 62;
   static const int projectStatusModel = 63;
+  static const int projectProgressModel = 64;
 
   // Enums (33-61)
   static const int userRole = 33;