Implemented the authenticated admin contact system.

app/Models/SupportAttachment.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace App\Models;
+
+use Database\Factories\SupportAttachmentFactory;
+use Illuminate\Database\Eloquent\Attributes\Fillable;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+#[Fillable(['support_message_id', 'disk', 'path', 'original_name', 'mime_type', 'size'])]
+class SupportAttachment extends Model
+{
+    /** @use HasFactory<SupportAttachmentFactory> */
+    use HasFactory;
+
+    public function message(): BelongsTo
+    {
+        return $this->belongsTo(SupportMessage::class, 'support_message_id');
+    }
+}