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.

src/hooks/useDragAndDrop.ts

@@ -0,0 +1,28 @@
+import { useState, useEffect } from 'react';
+import { useSensors, useSensor, PointerSensor } from '@dnd-kit/core';
+
+/**
+ * Hook pour gérer le drag & drop de manière safe avec SSR
+ * Désactive le DnD jusqu'à l'hydratation pour éviter les erreurs d'hydratation
+ */
+export function useDragAndDrop() {
+  const [isMounted, setIsMounted] = useState(false);
+
+  useEffect(() => {
+    // Activer le drag & drop après l'hydratation
+    setIsMounted(true);
+  }, []);
+
+  const sensors = useSensors(
+    useSensor(PointerSensor, {
+      activationConstraint: {
+        distance: 8,
+      },
+    })
+  );
+
+  return {
+    isMounted,
+    sensors
+  };
+}