Add the session manager (internal/sessions/manager.go) that orchestrates
multiple simultaneous SSH, Telnet, and RAW TCP sessions with:
- Protocol-specific connection logic using existing client implementations
- Credential resolution via OS keychain → encrypted vault → user prompt
- Wails runtime event emission for frontend state synchronisation
- Full session lifecycle management (connect, disconnect, reconnect)
- RAW session history and capture support
- Telnet break signal forwarding
Add the Wails-bound API service (internal/api/api.go) exposing:
- Profile CRUD with search, filtering, favourites, and duplication
- Session management (connect, disconnect, resize, write)
- RAW-specific text/hex/escaped write methods
- Secret store initialisation, unlock/lock, and per-profile secrets
- Known host listing and deletion
- Preferences get/save
- Profile import/export with skip/overwrite/duplicate strategies
- Audit log retrieval
- Native file dialog wrappers and app info
Remove conflicting protocol client stubs (client.go) that duplicated
the comprehensive implementations in sshclient.go, telnetclient.go,
and rawclient.go.
