feat:거래처 관리 목업 데이터를 실제 DB CRUD로 전환

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

app/Models/Finance/TradingPartner.php

@@ -0,0 +1,38 @@
+<?php
+
+namespace App\Models\Finance;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\SoftDeletes;
+
+class TradingPartner extends Model
+{
+    use SoftDeletes;
+
+    protected $table = 'trading_partners';
+
+    protected $fillable = [
+        'tenant_id',
+        'name',
+        'type',
+        'category',
+        'biz_no',
+        'bank_account',
+        'contact',
+        'email',
+        'manager',
+        'manager_phone',
+        'status',
+        'memo',
+    ];
+
+    public function scopeActive($query)
+    {
+        return $query->where('status', 'active');
+    }
+
+    public function scopeForTenant($query, $tenantId)
+    {
+        return $query->where('tenant_id', $tenantId);
+    }
+}