test(postman): exercise full Add Member CR field coverage

Updates the "[Step UI Test] Add Member" fixture to send every field
the post-extension backend now captures:
- isSoloParent + hasNoParents=true + noParentReason (D6 + alias path)
- nested healthInfo: facility, attending, deworming, disability,
  pregnancy, LMP — flattened by the service helper into top-level
  add_member_4ps detail fields (D4)
- nested educationInfo: facility, grade level, LRN,
  declarationSubmitted (D5)
- transferAccountInfo with two lines, one primary (D2)
- employmentInfo.lines (D3)
- achievementInfo.lines + hasSpecialRecognition (D3)
- idInfo with two ID documents (D3)

Lets a single Postman request verify every backend extension lands
on the resulting CR detail and creates the corresponding records on
the new partner after approval.

Author: haklyray