quality: dead code, dedup, constants, docs (audit Group E)

robustness: crash recovery, signal handling, atomicity (audit Group B)

fix(proxy): buffer request bodies to avoid chunked Transfer-Encoding, add HERMES_WEBUI_TRUST_FORWARDED_HOST=1

fix(docker): restore proper Dockerfile and add venv chown for hermes user

fix(permissions): chown /opt/hermes/.venv to hermes so auto-updates work

Update Dockerfile

fix(logs): silence noisy WebUI access log polls + bound on-disk log size

Initial release: HuggingMes + Hermes WebUI integration