fix(hermes): log provider startup semantics

[YOMXXX]

Summary

• log a Hermes provider startup banner explaining that memory.provider loads memory_tencentdb
• clarify that memory_enabled/user_profile_enabled only affect host prompt advertising, not plugin execution
• warn if host config fields are passed through with disabled-looking values

Fixes #95

Verification

• PYTHONPATH=/tmp/hermes-agent-stub HERMES_AGENT_ROOT=/tmp/hermes-agent-stub /tmp/tdai-memory-pytest-venv/bin/python -m pytest hermes-plugin/memory/memory_tencentdb/tests/test_memory_tencentdb_recovery.py -q
• npm test
• npm run build

[Maxwell-Code07]

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