feat: Initialize core application structure including authentication, role-based dashboards, service task management, and integration workflows.

app/Models/Attachment.php

@@ -0,0 +1,22 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+class Attachment extends Model
+{
+    protected $fillable = [
+        'service_task_id', 
+        'filename', 
+        'original_name', 
+        'path', 
+        'mime_type', 
+        'size'
+    ];
+
+    public function serviceTask()
+    {
+        return $this->belongsTo(ServiceTask::class);
+    }
+}