feat:거래처(trading_partners) 테이블 마이그레이션 추가

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

database/migrations/2026_02_04_221050_create_trading_partners_table.php

@@ -0,0 +1,36 @@
+<?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('trading_partners', function (Blueprint $table) {
+            $table->id();
+            $table->unsignedBigInteger('tenant_id');
+            $table->string('name', 100);
+            $table->string('type', 20)->default('vendor');
+            $table->string('category', 50)->default('기타');
+            $table->string('biz_no', 20)->nullable();
+            $table->string('bank_account', 100)->nullable();
+            $table->string('contact', 50)->nullable();
+            $table->string('email', 100)->nullable();
+            $table->string('manager', 50)->nullable();
+            $table->string('manager_phone', 20)->nullable();
+            $table->string('status', 20)->default('active');
+            $table->text('memo')->nullable();
+            $table->timestamps();
+            $table->softDeletes();
+            $table->index(['tenant_id', 'status']);
+            $table->index(['tenant_id', 'type']);
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('trading_partners');
+    }
+};