fix(docs): correct image path in root README.md and README.ko.md

[imjuni]

Summary

• README.md, README.ko.md의 이미지 경로 수정
  • packages/jin-frame/assets/jin-frame-brand-icon.png → assets/jin-frame-brand-icon.png (루트 기준 실제 경로)

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (7fe01cd) to head (fcad65d).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #203   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          107       107           
  Lines         1089      1089           
  Branches       293       293           
=========================================
  Hits          1089      1089           

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