docs: add Docker Compose user guide (Restricted/Godmode + Telegram)

Step-by-step guide for running Odek in Docker Compose under two permission
profiles — Restricted (default approval policy) and Godmode (YOLO) — plus a
Telegram bot section. Includes Dockerfile, compose services, and policy files.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: jkyberneees