feat: add idempotency support for settlement adjustments and payments, fix rebate handling

- Added idempotency_key parameter to settlement bill adjustment and payment endpoints to prevent duplicate operations
- Fixed player rebate profile updates to preserve existing values when only one field is modified
- Moved wallet player validation earlier in AdminPlayerStoreController to prevent unnecessary processing
- Enhanced extra rebate calculation to include 'in_bill' and 'settled' statuses in AgentP

database/migrations/2026_06_23_130000_add_idempotency_key_to_payment_and_adjustment.php

@@ -0,0 +1,34 @@
+<?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('payment_records', function (Blueprint $table): void {
+            $table->string('idempotency_key', 64)->nullable()->after('remark');
+            $table->index(['settlement_bill_id', 'idempotency_key']);
+        });
+
+        Schema::table('settlement_adjustments', function (Blueprint $table): void {
+            $table->string('idempotency_key', 64)->nullable()->after('reason');
+            $table->index(['original_bill_id', 'idempotency_key']);
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('payment_records', function (Blueprint $table): void {
+            $table->dropIndex(['settlement_bill_id', 'idempotency_key']);
+            $table->dropColumn('idempotency_key');
+        });
+
+        Schema::table('settlement_adjustments', function (Blueprint $table): void {
+            $table->dropIndex(['original_bill_id', 'idempotency_key']);
+            $table->dropColumn('idempotency_key');
+        });
+    }
+};