fix: display owner_name in project detail

src/pages/ProjectDetailPage.tsx

@@ -25,7 +25,7 @@ export default function ProjectDetailPage() {
     api.get<Project>(`/projects/${id}`).then(({ data }) => {
       setProject(data)
       setEditForm({
-        owner: data.owner || '',
+        owner: data.owner_name || data.owner || '',
         repo: data.repo || '',
         description: data.description || '',
         sub_projects: data.sub_projects || [],
@@ -114,7 +114,7 @@ export default function ProjectDetailPage() {
           <>
             <h2>📁 {project.name} {project.project_code && <span className="badge">{project.project_code}</span>}</h2>
             <p style={{ color: 'var(--text-dim)', marginTop: 4 }}>{project.description || 'No description'}</p>
-            <div className="text-dim">Owner: {project.owner}</div>
+            <div className="text-dim">Owner: {project.owner_name || project.owner || "Unknown"}</div>
             <button className="btn-transition" style={{ marginTop: 8 }} onClick={() => setEditing(true)}>Edit</button>
             <button className="btn-danger" style={{ marginLeft: 8 }} onClick={deleteProject}>Delete</button>
           </>