Integration Baniere dans le backend

backend/database/migrations/2026_10_02_000001_add_width_to_campaigns.php

@@ -0,0 +1,23 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+/** Largeur d'affichage de la bannière (px). Null = 600, valeur historique. */
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::table('campaigns', function (Blueprint $t) {
+            $t->unsignedSmallInteger('width')->nullable()->after('link_url');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('campaigns', function (Blueprint $t) {
+            $t->dropColumn('width');
+        });
+    }
+};