feat : 테이블 및 DB 마이그레이션 파일 추가

products
  - common_codes
  - parts
  - products
  - files
  - price_histories
  - boms
  - bom_items

  boards
  - boards
  - board_settings
  - posts
  - board_comments
  - board_files
  - post_custom_field_values

  permissions
  - menus
  - roles
  - user_menu_permissions
  - role_menu_permissions

  tenants
  - tenants
  - plans
  - subscriptions
  - payments

app/Models/Tenant.php

@@ -0,0 +1,45 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\SoftDeletes;
+
+class Tenant extends Model
+{
+    use SoftDeletes;
+
+    protected $fillable = [
+        'name',
+        'code',
+        'email',
+        'phone',
+        'address',
+        'tenant_st_code',
+        'plan_id',
+        'subscription_id',
+        'max_users',
+        'trial_ends_at',
+        'expires_at',
+        'last_paid_at',
+        'billing_tp_code',
+    ];
+
+    protected $casts = [
+        'trial_ends_at'   => 'datetime',
+        'expires_at'      => 'datetime',
+        'last_paid_at'    => 'datetime',
+        'max_users'       => 'integer',
+    ];
+
+    // 관계 정의 (예시)
+    public function plan()
+    {
+        return $this->belongsTo(Plan::class, 'plan_id');
+    }
+
+    public function subscription()
+    {
+        return $this->belongsTo(Subscription::class, 'subscription_id');
+    }
+}