fix(exam): replace unfounded 4-char title rule with explicit validation messages

- 考试名称仅要求非空,移除无依据的至少 4 字限制;保留及格分 1-100、
  至少一题、总分 100、题干/选项/答案完整、至少一名员工的发布校验
- 发布坞展示具体校验失败原因,不再静默禁用按钮
- CHANGELOG/README 同步 2026-07-25 组织姓名定向补齐与生产复核记录

mobile-uni/tests/customer-feedback-closure.test.mjs

@@ -55,6 +55,9 @@ test('员工考试与主管组卷路由、题目播报、真实人员多选和
   assert.match(edit, /selectedMemberIds\.value\.length < 100/);
   assert.match(edit, /members\.value\.slice\(0, 100\)/);
   assert.match(edit, /requestId/);
+  assert.doesNotMatch(edit, /title\.value\.trim\(\)\.length >= 4/);
+  assert.match(edit, /请填写考试名称/);
+  assert.match(edit, /publish-validation-message/);
   assert.match(service, /\/api\/aihr\/mobile\/exams\/supervisor/);
 });