Address PR review feedback for CRD v1beta1 RFC

- Remove VirtualMCPServer Config embedding sections (deferred to follow-up PR)
- Split OIDC config into shareable (issuer, jwksUri, claims) vs per-server (audience, scopes)
- Split Telemetry config into shareable (endpoint, settings) vs per-server (serviceName)
- Add namespace to all config references
- Add status size discussion to Open Questions
- Clean up Go implementation details, keep architecture-focused content
- Update reference types to show per-server override patterns

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: JAORMX