Remove store selection and simplify announcement creation

Remove the store selection field and associated logic from the announcement creation form and backend API to simplify the process and ensure all announcements are globally applicable.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: e437ffed-c31b-44eb-9fd5-b6f9faa8e7ce
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/1957c339-2757-4d1f-8e92-e9f71a1ce58e/e437ffed-c31b-44eb-9fd5-b6f9faa8e7ce/CvLQ6E2

server/routes.ts

@@ -3058,8 +3058,11 @@ RÉSUMÉ DU SCAN
       console.log('🎯 [SERVER] User is admin, proceeding with validation');
 
       const announcementData = insertAnnouncementSchema.parse({
-        ...req.body,
-        authorId: user.id,
+        title: req.body.title,
+        content: req.body.content,
+        type: req.body.type || 'info',
+        storeId: null, // Toutes les annonces sont globales
+        createdBy: user.id,
       });
 
       console.log('🎯 [SERVER] Announcement data validated:', announcementData);