fix: add dispatcher lock to prevent start/stop race condition

refactor: vendor zerodep files into _vendor/ and remove _crypto/

feat: add bearer token authentication for MCP HTTP transports

refactor: reorganize internal modules into _crypto/ and _cli/ sub-packages

Fix SQLite thread-safety: serialize all connection access with lock

Fix graceful shutdown: prevent SQLite errors on SIGTERM

Add CLI integration for Claude Code, Codex, and OpenCode

refactor: replace _filelock with zerodep filelock module

Bump version to 0.5.0

Move default session to subdirectory layout with auto-migration

Enable background polling for admin panel and MCP/OpenAPI server

Add screenshot gallery to Chinese README

Add admin panel screenshot gallery to README

Skip TestRegistry when toolregistry is not installed

Fix message_id precision loss in admin panel API