* feat: Feishu/WeCom CLI connectors with chat generating UX and themed toasts
Add gateway adapters for official Feishu and WeCom CLIs (install, device-code
user auth, isolated CONFIG_DIR keys), unify chat generating/scroll helpers,
and bind antd message through App.useApp for theme-aware toasts.
* docs+test: Windows-safe connector mocks and install-hooks guidance
Use pathlib-based fake_bin_path for CLI mocks, assert CONFIG_DIR under
OCTOP_HOME via Path joins, and document make install-hooks plus cross-
platform test rules in AGENTS.md and CONTRIBUTING.md.
