feat: add & list commands with deadlock fix
- Add 'add' command: register hosts via flags or interactive prompts
Supports password/key/both auth, groups, tags, notes, port override
- Add 'list' command: display hosts with filtering and formatting
Supports --group, --tag filters, --sort, table/json/wide output
- Fix deadlock bug in JSON storage (RLock within Lock)
Introduced internal list functions that don't lock
Affects: ListHosts/GetHost/SaveHost/DeleteHost + KeyPair + Snippet
- Add comprehensive tests for add and list commands
- Update PROJECT_STATE.md (Tasks 1-8 complete, ~55% done)
Swana Diva Borneos
4087c5fdc7