chore: connect to private package registry (Kellnr)

[MrBT-nano]

Proposal: Connect to Private Package Registry (Kellnr)

We have established a central private package registry using Kellnr on our local Kubernetes cluster. This registry supports Rust (crates), Python (pypi), and NPM packages.

Registry Details

• Base URL: http://kellnr.cntm.labs:31500
• Managed by: vtuber-ops (Issue chore: adopt Ecosystem Interaction Protocol in GEMINI.md and CLAUDE.md #2)
• Configuration Templates: Available in vtuber-commons/templates/registry/

How to Connect

You can use the setup script from vtuber-commons to configure this repository:

# From this repository's root
../vtuber-commons/scripts/setup_registry.sh

This will automatically create/update .cargo/config.toml, pip.conf, or .npmrc as needed for your project.

Why?

This is required to share shared configs, models, and loader packages across the vtuber-* ecosystem securely and efficiently.