[FEAT] 優化部署流程：加入 RoleSeeder 與 AdminUserSeeder，並實作權限系統基礎架構與多租戶隔離機制

app/Models/System/Company.php

@@ -0,0 +1,48 @@
+<?php
+
+namespace App\Models\System;
+
+use App\Models\Machine\Machine;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+use Illuminate\Database\Eloquent\SoftDeletes;
+use Spatie\Permission\Models\Role;
+
+class Company extends Model
+{
+    use HasFactory, SoftDeletes;
+
+    protected $fillable = [
+        'name',
+        'code',
+        'tax_id',
+        'contact_name',
+        'contact_phone',
+        'contact_email',
+        'status',
+        'valid_until',
+        'note',
+    ];
+
+    protected $casts = [
+        'valid_until' => 'date',
+        'status' => 'integer',
+    ];
+
+    /**
+     * Get the users for the company.
+     */
+    public function users(): HasMany
+    {
+        return $this->hasMany(User::class);
+    }
+
+    /**
+     * Get the machines for the company.
+     */
+    public function machines(): HasMany
+    {
+        return $this->hasMany(Machine::class);
+    }
+}