Migrate from OSSRH to Central Publisher Portal

[velo]

Summary

• Migrate publishing infrastructure from OSSRH to Sonatype Central Publisher Portal to address the OSSRH sunset deadline (June 30th, 2025)
• Replace nexus-staging-maven-plugin with central-publishing-maven-plugin for modern publishing workflow
• Update GitHub Actions environment variables and Maven server configuration

Changes Made

• Maven Configuration: Replace nexus-staging-maven-plugin with central-publishing-maven-plugin v0.8.0
• Distribution Management: Update URLs from OSSRH endpoints to Central Publisher Portal API
• Auto-publishing: Configure immediate publishing with autoPublish=true and waitUntil=published
• GitHub Actions: Update environment variables from SONATYPE_* to CENTRAL_TOKEN_*
• Maven Settings: Update server configuration from ossrh to central server ID

Required Actions Before Merge

1. Create account at https://central.sonatype.com
2. Generate publishing tokens in Central Portal
3. Update GitHub Secrets:
   • Add CENTRAL_TOKEN_USERNAME (replace SONATYPE_USER)
   • Add CENTRAL_TOKEN_PASSWORD (replace SONATYPE_PASSWORD)
4. Verify io.github.openfeign namespace is registered in Central Portal

Test Plan

• Verify Maven configuration compiles without errors
• Test publishing workflow in staging environment
• Confirm artifacts appear correctly in Central Portal
• Validate auto-publishing functionality works as expected

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