fix(jin-frame): v5.0.2 — safeParse plain-text response bug fix

[imjuni]

Summary

• safeParse 버그 수정: API가 plain string(hello 등 JSON-encode되지 않은 문자열)을 반환할 때 JSON.parse가 실패하여 undefined가 데이터로 설정되던 문제 수정
  • 수정 전: parse 실패 시 undefined 반환
  • 수정 후: parse 실패 시 원본 문자열 반환 (boolean/number는 JSON.parse가 정상 처리하므로 영향 없음)
• safeParse.test.ts 신규 추가: JSON object, array, boolean, number, null, plain string 8가지 케이스 커버

Test plan

• 전체 테스트 480개 통과 (pnpm --filter jin-frame test)
• safeParse 단위 테스트 8개 모두 통과

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (ed33067) to head (3d0c93d).

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #195   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files          107       107           
  Lines         1088      1088           
  Branches       289       289           
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  Hits          1088      1088           

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