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.

site-builder/package.json

@@ -7,7 +7,9 @@
     "dev": "vite",
     "build": "tsc -b && vite build",
     "lint": "eslint .",
-    "preview": "vite preview"
+    "preview": "vite preview",
+    "test": "vitest run",
+    "test:watch": "vitest"
   },
   "dependencies": {
     "axios": "^1.13.2",
@@ -19,6 +21,8 @@
     "zustand": "^5.0.8"
   },
   "devDependencies": {
+    "@testing-library/jest-dom": "^6.6.3",
+    "@testing-library/react": "^16.2.0",
     "@eslint/js": "^9.39.1",
     "@types/node": "^24.10.0",
     "@types/react": "^19.2.2",
@@ -31,6 +35,8 @@
     "globals": "^16.5.0",
     "typescript": "~5.9.3",
     "typescript-eslint": "^8.46.3",
-    "vite": "^7.2.2"
+    "vite": "^7.2.2",
+    "vitest": "^2.1.5",
+    "jsdom": "^25.0.1"
   }
 }