feat: implement core foundation (v0.1)

[MrBT-nano]

📝 Description

This PR implements the initial scaffolding for the vtuber-image core foundation as outlined in the Foundation Plan.

Key changes:

• Defined gRPC interface for image generation (proto/vtuber_image/v1/image.proto)
• Initialized Rust gRPC server using tonic and tokio
• Added Python ComfyUI client skeleton for REST API interaction
• Provided docker-compose.yml for local SeaweedFS setup (Podman compatible)
• Implemented a simple bridge from Rust to the Python worker

🔗 Related Issues

Fixes #1 (Initial Foundation)

🛠️ Type of Change

• 🚀 New feature

✅ Checklist

• Tests passed locally (build and manual script check)
• Documentation updated
• Code follows project style guidelines
• Linked to the appropriate Issue
• cargo fmt and cargo clippy pass

🏷️ Metadata

• Assignee: @MrBT-nano
• Labels: feat

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