fix: restore legacy cron schedules and shell diagnostics (#3078)

test/back/shell-translation-output.test.cjs

@@ -0,0 +1,16 @@
+const test = require('node:test');
+const assert = require('node:assert/strict');
+const { spawnSync } = require('node:child_process');
+
+test('shell translations print leading dashes, placeholders and newlines', () => {
+  const result = spawnSync('bash', ['-c', String.raw`
+    source shell/share.sh
+    t '---> 服务诊断信息'
+    t '---> 最近的系统日志: %s' '/tmp/test.log'
+    t 'first\nsecond'
+  `], { encoding: 'utf8', env: { ...process.env, QL_DIR: process.cwd() } });
+  assert.equal(result.status, 0, result.stderr);
+  assert.equal(result.stderr, '');
+  assert.equal(result.stdout,
+    '---> 服务诊断信息\n---> 最近的系统日志: /tmp/test.log\nfirst\nsecond\n');
+});