feat(x): add Dockerfile and headless server entry point

[Imccccc]

Summary

Adds support for running the Rowboat agent core in a headless Docker environment (e.g. for server deployment).

Changes

• Added apps/x/apps/server: A minimal Node.js entry point that initializes the agent core services (Gmail/Calendar sync, Agent Runner, etc.) without Electron.
• Added apps/x/Dockerfile: A Dockerfile to build and run the headless agent.
• Added apps/x/DOCKER.md: Documentation on how to build and run.

Usage

cd apps/x
docker build -t rowboat-agent .
docker run -v ~/.rowboat:/data/.rowboat rowboat-agent

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