Add optional owner gateway routing to Give.

Co-authored-by: Cursor <cursoragent@cursor.com>

database/migrations/2026_07_21_193000_create_payment_gateway_settings_table.php

@@ -0,0 +1,27 @@
+<?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::create('payment_gateway_settings', function (Blueprint $table) {
+            $table->id();
+            $table->string('owner_ref', 64)->unique();
+            $table->string('provider', 32);
+            $table->text('public_key')->nullable();
+            $table->text('secret_key')->nullable();
+            $table->boolean('is_active')->default(false);
+            $table->json('metadata')->nullable();
+            $table->timestamps();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('payment_gateway_settings');
+    }
+};