Feature: Add WhatsApp notifications for collection-ready orders

- Implement WhatsApp Business API integration via Meta Cloud API
- Add phoneNumber field to Order model for storing customer phone numbers
- Update admin order detail page with phone number input for collection orders
- Send WhatsApp notification when admin marks order as ready for collection
- Add WhatsApp service module with phone number formatting and message sending
- Create database migrations for collection-related fields
- Add WhatsApp credentials to .env configuration

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

src/app/admin/gallery/actions.ts

@@ -59,13 +59,14 @@ export async function deleteGalleryPhoto(formData: FormData) {
 
 export async function createGalleryCategory(formData: FormData) {
   const name = String(formData.get('name') ?? '').trim();
+  const redirectTo = String(formData.get('redirectTo') ?? '/admin/gallery/categories').trim();
   if (!name) throw new Error('Category name is required.');
 
   const slug = await uniqueSlug(slugify(name));
 
   await prisma.galleryCategory.create({ data: { name, slug } });
 
-  redirect('/admin/gallery/categories');
+  redirect(redirectTo);
 }
 
 export async function deleteGalleryCategory(formData: FormData) {