fix(docker): resolve container networking and DB compatibility issues (#560)

- Auto-detect Docker container environment and use service name
  'hermes-agent' as default host instead of 127.0.0.1
- Replace hardcoded column names with SELECT * in session DB queries
  to compat with older Hermes agent state.db schemas
- Remove unused UPSTREAM env var from docker-compose.yml
- Include err.message in syncFromHermes failure logs
- Add group chat rule to prevent self-mentioning

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

docker-compose.yml

@@ -32,7 +32,6 @@ services:
       - hermes-agent-src:/opt/hermes
     environment:
       - PORT=${PORT:-6060}
-      - UPSTREAM=${UPSTREAM:-http://hermes-agent:8642}
       - HERMES_HOME=/home/agent/.hermes
       - HERMES_BIN=${HERMES_BIN:-/opt/hermes/.venv/bin/hermes}
       - AUTH_DISABLED=${AUTH_DISABLED:-false}