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/UserMenuPermission.php

@@ -0,0 +1,22 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+class UserMenuPermission extends Model
+{
+    protected $fillable = [
+        'user_id', 'menu_id', 'access', 'read', 'write', 'export', 'approve'
+    ];
+
+    public function user()
+    {
+        return $this->belongsTo(User::class, 'user_id');
+    }
+
+    public function menu()
+    {
+        return $this->belongsTo(Menu::class, 'menu_id');
+    }
+}