Python and various other Updates/Fixes

[rbartl]

Summary of changes:

• Python 3.11 upgrade (Docker, Pipfile, CI).
• Deps updated: pymongo, tornado; dropped hyper, added httpx.
• Docker changes: cleaner Dockerfile, new self-contained docker-compose, GHCR workflow.
• Code fixes: logging, Mongo API (list_collection_names), APNS switched to httpx.
• Scripts: start.sh improved (env vars, config auto-gen, logs to stdout/stderr).
• Docs: updated for Python 3.11 & Docker rebuild.
• Tests: refactored for httpx.