feat:barobill_bank_transactions에 거래처코드(client_code, client_name) 컬럼 추가

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

database/migrations/2026_02_19_100000_add_client_fields_to_barobill_bank_transactions.php

@@ -0,0 +1,25 @@
+<?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('barobill_bank_transactions', function (Blueprint $table) {
+            $table->string('client_code', 50)->nullable()->comment('거래처 코드')->after('account_name');
+            $table->string('client_name', 100)->nullable()->comment('거래처명')->after('client_code');
+            $table->index(['tenant_id', 'client_code'], 'bb_trans_tenant_client_idx');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('barobill_bank_transactions', function (Blueprint $table) {
+            $table->dropIndex('bb_trans_tenant_client_idx');
+            $table->dropColumn(['client_code', 'client_name']);
+        });
+    }
+};