Sederhanakan ambang SP: hapus kolom max_points

- max_points tidak pernah dipakai logika penerbitan SP (trigger hanya baca
  min_points: level dgn ambang tertinggi <= total poin siswa)
- Migrasi drop kolom; model, MasterDataController, ResetController (seeder)
  dibersihkan; form Ambang SP & form tambah cukup satu angka (Min Poin)
- Dashboard Ambang SP: batas atas level dihitung dari min_points level
  berikutnya (level terakhir = tak terbatas), urutan dijamin orderBy min_points
- Test: 29 passed / 99 assertion

app/Http/Controllers/DashboardController.php

@@ -59,7 +59,7 @@ class DashboardController extends Controller
             ->where('is_read', false)
             ->count();
 
-        $spThresholds = \App\Models\SpThreshold::where('is_active', true)->get();
+        $spThresholds = \App\Models\SpThreshold::where('is_active', true)->orderBy('min_points')->get();
 
         // Data untuk calendar: pelanggaran per tanggal di bulan ini
         $calendarData = Violation::selectRaw('DATE(violation_date) as date, COUNT(*) as count')