fix: resolve CI E2E test failures

- Fix disposed response object in Playwright route handler
- Add git user config to prevent 'empty ident' errors
- Increase server startup timeout and improve debugging
- Fix YAML indentation in E2E workflow

Resolves:
- 'Response has been disposed' error in open-existing-project test
- Git identity configuration issues in CI
- Backend server startup timing issues

apps/ui/tests/projects/open-existing-project.spec.ts

@@ -104,7 +104,11 @@ test.describe('Open Project', () => {
           json.settings.projects = [testProject, ...existingProjects];
         }
       }
-      await route.fulfill({ response, json });
+      await route.fulfill({
+        status: response.status(),
+        headers: response.headers(),
+        json,
+      });
     });
 
     // Now navigate to the app