feat: add Shift Planning module with full CRUD, attendance, and reporting

- Add shifts, shift_staff, and shift_attendance migrations
- Add Shift, ShiftStaff, ShiftAttendance Eloquent models with auditing
- Add ShiftService with business logic (create, start, complete, assign staff, mark attendance, reports, timesheets)
- Add ShiftResource with list, create, edit, and attendance management pages
- Add staff and attendance relation managers
- Add standalone pages: ActiveShifts, StaffManagement, ShiftReports, Timesheets
- Add dashboard widgets: ShiftOverview stats, TodaysShifts table
- Add ShiftPolicy for role-based authorization
- Add 10 shift permissions and manager role to RolePermissionSeeder
- Update User model with shift relationships
- Fix audits table migration with required columns for owen-it/laravel-auditing
- Update DatabaseSeeder to create admin user and call RolePermissionSeeder
- Switch docker-compose to MariaDB 10.11 for Docker Desktop compatibility

src/app/Models/ShiftAttendance.php

@@ -0,0 +1,44 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use OwenIt\Auditing\Contracts\Auditable;
+
+class ShiftAttendance extends Model implements Auditable
+{
+    use \OwenIt\Auditing\Auditable;
+
+    protected $table = 'shift_attendance';
+
+    protected $fillable = [
+        'shift_id',
+        'user_id',
+        'status',
+        'marked_by',
+        'marked_at',
+    ];
+
+    protected function casts(): array
+    {
+        return [
+            'marked_at' => 'datetime',
+        ];
+    }
+
+    public function shift(): BelongsTo
+    {
+        return $this->belongsTo(Shift::class);
+    }
+
+    public function user(): BelongsTo
+    {
+        return $this->belongsTo(User::class);
+    }
+
+    public function marker(): BelongsTo
+    {
+        return $this->belongsTo(User::class, 'marked_by');
+    }
+}