Updates all imports and go.mod to use the new /v3 suffixed module path for proper Go semantic versioning compliance. Also updates CI workflows to use version tags (v3.x.x) instead of pseudo-versions now that the server module has the proper /v3 suffix. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>