fix(memos-local-plugin): serialize Hermes viewer daemon startup

[hijzy]

Summary

• add a cross-process startup lock around the Hermes viewer daemon launch path
• re-probe :18800 after acquiring the lock so concurrent no-viewer sessions reuse the daemon
• keep --no-viewer stdio bridges out of the viewer daemon pid file

Tests

• /Users/jiang/MyProject/MemOS-jiang/.venv/bin/ruff format apps/memos-local-plugin/adapters/hermes/memos_provider/daemon_manager.py apps/memos-local-plugin/tests/python/test_bridge_client.py
• /Users/jiang/MyProject/MemOS-jiang/.venv/bin/ruff check apps/memos-local-plugin/adapters/hermes/memos_provider/daemon_manager.py apps/memos-local-plugin/tests/python/test_bridge_client.py
• python3 -m unittest tests.python.test_bridge_client
• npm run lint
• npx vitest run tests/unit/bridge/methods.test.ts tests/unit/bridge/stdio.test.ts