feat: snapshot class_name di setiap presensi & pelanggaran

Migration: tambah kolom:
- attendances.class_name (varchar 100)
- violations.student_class (varchar 100)
- Backfill data existing dari students.class_name

Controller manual: simpan class_name dari form
Sync E-Jurnal: simpan class_name dari lookup student
ViolationService: ambil class_name dari student saat buat
Model: tambah ke fillable

Ini menjamin data historis tetap akurat meskipun
 siswa naik kelas (X→XI→XII) di tahun ajaran baru.

app/Http/Controllers/Api/AttendanceSyncController.php

@@ -51,9 +51,11 @@ class AttendanceSyncController extends Controller
         ];
 
         $sourceIds = array_unique(array_column($attendances, 'source_student_id'));
-        $studentMap = Student::whereIn('source_id', $sourceIds)
+        \$students = Student::whereIn('source_id', $sourceIds)
             ->where('is_active', true)
-            ->pluck('id', 'source_id');
+            ->get(['id', 'source_id', 'class_name']);
+        $studentMap = $students->pluck('id', 'source_id');
+        $classNameMap = $students->pluck('class_name', 'id');
 
         $alphaCounts = [];
         $alphaDate = null;
@@ -88,6 +90,7 @@ class AttendanceSyncController extends Controller
                     ],
                     [
                         'status' => $localStatus,
+                        'class_name' => $classNameMap[$localStudentId] ?? null,
                         'notes' => $item['notes'] ?? null,
                         'recorded_by' => null,
                     ]

app/Http/Controllers/AttendanceController.php

@@ -162,6 +162,7 @@ class AttendanceController extends Controller
                     ],
                     [
                         'status' => $data['status'],
+                        'class_name' => $class_name,
                         'recorded_by' => $request->user()->id,
                     ]
                 );

app/Models/Attendance.php

@@ -8,7 +8,7 @@ use Illuminate\Database\Eloquent\Relations\BelongsTo;
 class Attendance extends Model
 {
     protected $fillable = [
-        'student_id', 'date', 'lesson_hour',
+        'student_id', 'class_name', 'date', 'lesson_hour',
         'status', 'notes', 'recorded_by',
     ];
 

app/Models/Violation.php

@@ -12,7 +12,7 @@ class Violation extends Model
     use SoftDeletes;
 
     protected $fillable = [
-        'student_id', 'violation_type_id', 'recorded_by',
+        'student_id', 'student_class', 'violation_type_id', 'recorded_by',
         'description', 'points', 'sanction', 'location',
         'violation_date', 'violation_time',
         'is_verified', 'verified_by', 'verified_at',

app/Services/ViolationService.php

@@ -19,6 +19,7 @@ class ViolationService
         $violation = DB::transaction(function () use ($data, $userId) {
             $violation = Violation::create([
                 'student_id' => $data['student_id'],
+                'student_class' => \App\Models\Student::where('id', $data['student_id'])->value('class_name'),
                 'violation_type_id' => $data['violation_type_id'],
                 'recorded_by' => $userId,
                 'description' => $data['description'] ?? null,