feat: API wali murid (Sanctum) + verifikasi admin

- Pasang laravel/sanctum, routes/api.php (prefix api/v1, 10 endpoint)
- Migrasi: parent_name di students, parent_students (pivot wali↔anak),
  parent_devices (token FCM), permission parents-verify
- Auth wali: registrasi NISN+HP (auto-verify jika HP cocok data siswa,
  pending jika tidak) + login token Sanctum
- Endpoint: me, logout, students, link anak, violations, sp-letters,
  notifications, register device
- Halaman admin Verifikasi Wali (approve/reject) + menu sidebar
- Sync kesiswaan: tarik data orang tua (student_parents) ke students
- 8 feature test baru (ParentApiTest) — total suite 39 test hijau

app/Models/ParentDevice.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+class ParentDevice extends Model
+{
+    protected $fillable = [
+        'user_id', 'platform', 'fcm_token', 'device_name', 'last_active_at',
+    ];
+
+    protected function casts(): array
+    {
+        return [
+            'last_active_at' => 'datetime',
+        ];
+    }
+
+    public function user()
+    {
+        return $this->belongsTo(User::class, 'user_id');
+    }
+}