Add wallet auto-withdraw threshold support for Ladill Mini.

Store per-user auto-withdraw amounts, expose them via the wallet API, and process withdrawals when balances reach the configured threshold after payments or on a schedule.

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

database/migrations/2026_06_12_120000_add_auto_withdraw_to_qr_settings_table.php

@@ -0,0 +1,22 @@
+<?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('qr_settings', function (Blueprint $table) {
+            $table->unsignedBigInteger('auto_withdraw_amount_minor')->nullable()->after('notify_payouts');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('qr_settings', function (Blueprint $table) {
+            $table->dropColumn('auto_withdraw_amount_minor');
+        });
+    }
+};