chore: Remove obsolete migration file

database/migrations/2025_11_21_055010_add_marketing_channel_id_to_broadcasts_table.php

@@ -1,33 +0,0 @@
-<?php
-
-use Illuminate\Database\Migrations\Migration;
-use Illuminate\Database\Schema\Blueprint;
-use Illuminate\Support\Facades\Schema;
-
-return new class extends Migration
-{
-    /**
-     * Run the migrations.
-     */
-    public function up(): void
-    {
-        Schema::table('broadcasts', function (Blueprint $table) {
-            $table->foreignId('marketing_channel_id')
-                ->nullable()
-                ->after('business_id')
-                ->constrained('marketing_channels')
-                ->nullOnDelete();
-        });
-    }
-
-    /**
-     * Reverse the migrations.
-     */
-    public function down(): void
-    {
-        Schema::table('broadcasts', function (Blueprint $table) {
-            $table->dropForeign(['marketing_channel_id']);
-            $table->dropColumn('marketing_channel_id');
-        });
-    }
-};