Add a microphone mute control to the remote operation UI and wire it into the audio pipeline and settings. A new checkbox (remoteOperationMicMuteToggle) is added to the view. JavaScript gains a micMuted setting (default true), persistence to localStorage, UI syncing, and an applyMicMuteState() helper which enables/disables audio tracks on the media stream. The setting is applied when a stream is attached and updated immediately when the user toggles the checkbox.
Add server endpoints to store and retrieve the remote operation link password in the user's account and update the client to use them. Qso controller: added remoteoperationsecret_json and remoteoperationsecret_save which use user_options_model and CI encryption to get/set an encrypted link_password (save enforces a minimum 16-char password, empty value clears it). View and JS: default WebSocket URL changed to wss://relay.cloudlog.org/ws-webrtc; client no longer stores link password in localStorage and instead loads/saves it via the new endpoints (with error handling and UI feedback). Also clear the account secret on reset and stop exposing the password in browser storage.
Introduce an experimental browser-based remote audio feature: bump migration version to 270 and add a migration to add a remote_operation flag to the users table. Add server-side support to User and QSO controllers/models to read/save the remote_operation option (stored via user_options_model) and expose isRemoteOperationEnabled to views and session updates. Add UI: a Remote Operation card on the QSO page, a modal component for detailed settings, a toggle in the user edit page, and conditional loading of assets/js/remote-operation.js. Add a large client-side implementation (assets/js/remote-operation.js) implementing WebRTC signalling, device selection, level meters and diagnostics. Minor session/session-update and helper changes to keep UI state in sync.
