Version Bump to 1.51-E

This automated PR bumps the version and includes an auto-generated changelog.

✅ Pre-Merge Checklist

• Review the generated changelog in assets/changelogs/
• Verify manifest.json version update is correct
• Check that all changes are intentional

📋 Post-Merge Steps (REQUIRED)

After you merge this PR, you must manually create and push the tag to trigger the release workflow:

# 1. Update your local main branch
git checkout main
git pull origin main

# 2. Create the tag
git tag 1.51-E

# 3. Push the tag to trigger release workflow
git push origin 1.51-E

Why manual? For security, only maintainers can create tags that trigger releases.

📊 Release Summary

• Version: 1.51-E
• PRs included: 6
• Contributors: @Someon1e (aaaaankier), @h0tp-ftw (h0tp)
• New contributors: None