[xlorne]

开始节点提交时只对直接下游节点做 APPROVER_SELECT 判断，人工节点选中分支后
matchNextNodes 返回的是分支节点（MANUAL_BRANCH），分支内的审批人设定节点因而 被漏判：前端不弹选人框，流程直接流转到该节点并因无审批人异常（同 #258 根因）。
改为与审批节点提交路径一致，复用 collectApproverSelectNodes 递归收集，
条件分支仍只沿命中分支、分支节点只看首个节点，兼容 #200 / #231 行为。

Closes #259

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.45%. Comparing base (046e83c) to head (bd15fe7).
⚠️ Report is 4 commits behind head on dev.

Additional details and impacted files

@@             Coverage Diff              @@
##                dev     #262      +/-   ##
============================================
- Coverage     74.49%   74.45%   -0.05%     
+ Complexity     1808     1806       -2     
============================================
  Files           236      236              
  Lines          7485     7484       -1     
  Branches        865      861       -4     
============================================
- Hits           5576     5572       -4     
- Misses         1487     1490       +3     
  Partials        422      422              

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