chore: refactor project structure and clean up unused components

- Updated `TODO.md` to reflect new testing tasks and final structure expectations.
- Simplified TypeScript path mappings in `tsconfig.json` for better clarity.
- Revised business logic separation rules in `.cursor/rules` to align with new directory structure.
- Deleted unused client components and services to streamline the codebase.
- Adjusted import paths in scripts to match the new structure.

scripts/seed-data.ts

@@ -1,5 +1,5 @@
-import { tasksService } from '../services/tasks';
-import { TaskStatus, TaskPriority } from '../lib/types';
+import { tasksService } from '../src/services/tasks';
+import { TaskStatus, TaskPriority } from '../src/lib/types';
 
 /**
  * Script pour ajouter des données de test avec tags et variété