Remove obsolete scripts and files, update site builder configurations

- Deleted the `import_plans.py`, `run_tests.py`, and `test_run.py` scripts as they are no longer needed.
- Updated the initial migration dependency in `0001_initial.py` to reflect recent changes in the `igny8_core_auth` app.
- Enhanced the implementation plan documentation to include new phases and updates on the site builder project.
- Updated the `vite.config.ts` and `package.json` to integrate testing configurations and dependencies for the site builder.

backend/igny8_core/api/tests/run_tests.py

@@ -1,25 +0,0 @@
-#!/usr/bin/env python
-"""
-Test runner script for API tests
-Run all tests: python manage.py test igny8_core.api.tests
-Run specific test: python manage.py test igny8_core.api.tests.test_response
-"""
-import os
-import sys
-import django
-
-# Setup Django
-os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'igny8_core.settings')
-django.setup()
-
-from django.core.management import execute_from_command_line
-
-if __name__ == '__main__':
-    # Run all API tests
-    if len(sys.argv) > 1:
-        # Custom test specified
-        execute_from_command_line(['manage.py', 'test'] + sys.argv[1:])
-    else:
-        # Run all API tests
-        execute_from_command_line(['manage.py', 'test', 'igny8_core.api.tests', '--verbosity=2'])
-