feat: dynamic role-based permission system

- Add permissions & role_permissions tables with migration
- Add PermissionMiddleware for route-level access control
- Add CheckRole middleware for role-based fallback
- Add PermissionController with UI (Settings > Hak Akses Role)
- Add @canPermission Blade directive for view-level checks
- Convert all routes to use dynamic permission middleware
- Add canPermission() method to User model
- All access rights configurable via admin UI

app/Http/Middleware/PermissionMiddleware.php

@@ -0,0 +1,47 @@
+<?php
+
+namespace App\Http\Middleware;
+
+use Closure;
+use Illuminate\Http\Request;
+use Illuminate\Support\Facades\Cache;
+use Symfony\Component\HttpFoundation\Response;
+
+class PermissionMiddleware
+{
+    /**
+     * Handle an incoming request.
+     *
+     * @param  \Closure(\Illuminate\Http\Request): (\Symfony\Component\HttpFoundation\Response)  $next
+     */
+    public function handle(Request $request, Closure $next, string ...$permissions): Response
+    {
+        $user = $request->user();
+
+        if (! $user) {
+            abort(403, 'Unauthorized.');
+        }
+
+        // Admin always has all permissions
+        if ($user->role === 'admin') {
+            return $next($request);
+        }
+
+        // Cache role permissions (cleared when role_permissions changes)
+        $rolePermissions = Cache::remember('role_permissions:' . $user->role, 3600, function () use ($user) {
+            return \DB::table('role_permissions')
+                ->join('permissions', 'role_permissions.permission_id', '=', 'permissions.id')
+                ->where('role_permissions.role', $user->role)
+                ->pluck('permissions.key')
+                ->toArray();
+        });
+
+        foreach ($permissions as $permission) {
+            if (in_array($permission, $rolePermissions)) {
+                return $next($request);
+            }
+        }
+
+        abort(403, 'Anda tidak memiliki izin untuk mengakses halaman ini.');
+    }
+}