refactor: unify bag and admin layout routing

app/Controllers/Admin/WorkMovedToBag.php

@@ -0,0 +1,41 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Controllers\Admin;
+
+use App\Controllers\BaseController;
+
+/**
+ * 구 관리자 업무 URL(admin/…) → 메인 사이트 업무 URL(bag/…) 영구 이전.
+ * POST 폼은 307로 메서드·본문 유지를 시도하고, GET 은 301.
+ */
+class WorkMovedToBag extends BaseController
+{
+    public function toBag(string $prefix, string $rest = ''): \CodeIgniter\HTTP\RedirectResponse
+    {
+        $rest = trim($rest, '/');
+
+        if ($prefix === 'packaging-units') {
+            $path = 'packaging-units/manage';
+            if ($rest !== '') {
+                $path .= '/' . $rest;
+            }
+        } else {
+            $path = $prefix;
+            if ($rest !== '') {
+                $path .= '/' . $rest;
+            }
+        }
+
+        $target = site_url('bag/' . $path);
+        $query  = $this->request->getUri()->getQuery();
+        if ($query !== '') {
+            $target .= '?' . $query;
+        }
+
+        $code = $this->request->getMethod() === 'post' ? 307 : 301;
+
+        return redirect()->to($target)->setStatusCode($code);
+    }
+}