fix(ci): use awk for reliable README multiline replacement

[JasonXuDeveloper]

Summary

Fixes two issues with the README update logic in the release workflow from PR #566:

Issue 1: sed c\ command doesn't work with multiline content

The previous approach used:

sed -i '/pattern/,/pattern/c\'"$NEW_SECTION" README.md

This fails on Linux because sed's c\ command doesn't handle multiline variables properly.

Fix: Use awk instead, which handles multiline replacement reliably:

awk '
  /^## 🎉 Latest Features/ { skip=1; while((getline < file) > 0) print; }
  /^\[📋 View Complete Changelog\]/ { skip=0; next }
  !skip { print }
' README.md

Issue 2: Feature extraction edge cases

• When concatenating FEATURES and FIXES, empty strings could create leading newlines
• Empty lines weren't being filtered out

Fix: Added proper checks before concatenation and filter empty lines with sed '/^$/d'

Changes

• Replace sed -i ... c\ with awk for both README.md and README_zh_cn.md
• Write replacement content to temp file first
• Fix feature/fix concatenation logic
• Filter empty lines from extracted features

Test plan

• Run release workflow and verify README.md is updated correctly
• Verify README_zh_cn.md is updated correctly
• Check that empty changelog sections don't create extra blank lines

🤖 Generated with Claude Code

[claude]

Code review

No issues found. Checked for bugs and CLAUDE.md compliance.

[github-actions]

Unity Test Results

✅ EditMode: All tests passed
✅ PlayMode: All tests passed

Unity Version: 2022.3.55f1
Project Path: UnityProject

✅ All tests passed! The PR is ready for review.

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