Fix frontend compatibility with paginated API response

- Update frontend API client to extract items from paginated response
- Fix SPA routing to serve index.html for /project/* paths on refresh

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

frontend/src/api.ts

@@ -10,10 +10,22 @@ async function handleResponse<T>(response: Response): Promise<T> {
   return response.json();
 }
 
+// Paginated response type
+interface PaginatedResponse<T> {
+  items: T[];
+  pagination: {
+    page: number;
+    limit: number;
+    total: number;
+    total_pages: number;
+  };
+}
+
 // Project API
 export async function listProjects(): Promise<Project[]> {
   const response = await fetch(`${API_BASE}/projects`);
-  return handleResponse<Project[]>(response);
+  const data = await handleResponse<PaginatedResponse<Project>>(response);
+  return data.items;
 }
 
 export async function createProject(data: { name: string; description?: string; is_public?: boolean }): Promise<Project> {