fix: flatten order/quotation data in project detail response

Project detail API returned nested orders/quotations objects but frontend
expected flat order_number, order_status, quotation_number fields.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/services/projects.service.ts

@@ -76,8 +76,12 @@ export async function getProject(id: number) {
     },
   });
   if (!project) return null;
+  const { orders, quotations, ...rest } = project;
   return {
-    ...project,
+    ...rest,
+    order_number: orders?.order_number ?? null,
+    order_status: orders?.status ?? null,
+    quotation_number: quotations?.quotation_number ?? null,
     has_nas_folder: project.project_number
       ? nasFileManager.projectFolderExists(project.project_number)
       : false,