chore: wip bun compile

[HKGx]

Dockerfile and Build Process Improvements:

• Refactored the Dockerfile to use a multi-stage build: now compiles and minifies the app in a bun-based build stage, then copies the compiled binary and necessary files into a minimal distroless image.

Devcontainer Enhancements:

• Updated .devcontainer/devcontainer.json to specify explicit feature versions and add support for Docker-in-Docker for easier testing of the docker builds inside of a devcontainer