feat(admin): streamline ticket management with dialogs

Move on-behalf ticket creation into a header dialog and load ticket handling on demand. Reuse the admin REST write path, preserve drafts and filters, and cover dialog and server boundaries with regression tests.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

tests/admin/ticket-admin-rest.test.cjs

@@ -0,0 +1,14 @@
+'use strict';
+
+const assert = require('node:assert/strict');
+const { execFileSync } = require('node:child_process');
+const path = require('node:path');
+const test = require('node:test');
+
+const root = path.resolve(__dirname, '../..');
+const harness = path.join(root, 'tests', 'admin', 'ticket-admin-rest-harness.php');
+
+test('工单管理 REST 校验与通知边界通过 PHP stub harness', () => {
+  const output = execFileSync('php', [harness], { encoding: 'utf8' });
+  assert.match(output, /Ticket admin REST harness passed/);
+});