feat: penanganan pelanggaran (handling system)

- Migration: handling_status, handled_at, handled_by ke violations
- Migration: tabel violation_handlings, handling_participants
- Model: ViolationHandling, HandlingParticipant + relasi
- Routes: storeHandling, resolveHandling, destroyHandling, calendar data
- ViolationController: CRUD penanganan + filter status handling
- DashboardController: data handling stats + calendar endpoint
- Dashboard view: kalender pelanggaran interaktif (Alpine.js)
- Violations index: filter status penanganan + kolom status
- Violations show: stat card penanganan + timeline + modal tambah
- Menambahkan handling_status filter di index

app/Models/ViolationHandling.php

@@ -0,0 +1,37 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+
+class ViolationHandling extends Model
+{
+    protected $fillable = [
+        'violation_id', 'handling_type', 'handling_date',
+        'description', 'location', 'evidence', 'created_by',
+    ];
+
+    protected function casts(): array
+    {
+        return [
+            'handling_date' => 'date',
+        ];
+    }
+
+    public function violation(): BelongsTo
+    {
+        return $this->belongsTo(Violation::class);
+    }
+
+    public function creator(): BelongsTo
+    {
+        return $this->belongsTo(User::class, 'created_by');
+    }
+
+    public function participants(): HasMany
+    {
+        return $this->hasMany(HandlingParticipant::class, 'handling_id');
+    }
+}