- RightPanel: add use_embedded_db parameter, conditionally mount CypherQueryBox
- RightPanel.get_cypher_query_box(): return None if not exists
- RightPanel.has_cypher_query_box(): check if Cypher UI is available
- app.py: pass USE_EMBEDDED_DB to RightPanel
- app.py: action_focus_query shows notification when Cypher unavailable
- Update help text to note F4 is Neo4j-only
- Fix F3 tool details: use display:none/block instead of re-compose
- Increase sidebar width from 40 to 70 for readability
- Sync 一键启动指南.md with actual entry points (trulymem_entry.py)
- Rewrite 工作记忆链机制说明.md with actual task_* tool APIs
- Rewrite 架构.md with actual file structure (38 Python files)
- Update docs/README.md with complete feature list