[Platform] CI configuration update

[shineRR]

PR-Codex overview

This PR updates the GitHub Actions configuration for the swift.yml workflow and modifies the README.md file to improve the CI badge and add a platform badge.

Detailed summary

• Updated Xcode selection from 16.2 to 26.1.1.
• Changed test destination from OS=18.2,name=iPhone 16 Pro to OS=26.1,name=iPhone 17.
• Replaced the CI badge in README.md with a link to the current GitHub Actions workflow.
• Added a platform badge in README.md.
• Retained the existing version and license badges in README.md.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.94%. Comparing base (3fd8211) to head (93e25e3).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #9      +/-   ##
==========================================
- Coverage   84.06%   82.94%   -1.12%     
==========================================
  Files          52       52              
  Lines        1330     1190     -140     
==========================================
- Hits         1118      987     -131     
+ Misses        212      203       -9     

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