feat: meal post visibility

database/migrations/2026_05_16_140000_add_visibility_to_meal_posts_table.php

@@ -0,0 +1,26 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::table('meal_posts', function (Blueprint $table): void {
+            $table
+                ->string('visibility', 20)
+                ->default('private')
+                ->index();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('meal_posts', function (Blueprint $table): void {
+            $table->dropIndex(['visibility']);
+            $table->dropColumn('visibility');
+        });
+    }
+};