fix(config-backup): origin is a stored random id, Settings refills after a settings restore, clis.json reloads

Review round 2 on #661: the hostname in the origin orphaned every snapshot when a Docker container was recreated, so the origin is a random id kept in <data dir>/config-backup-id; after restoring settings.json the Settings form is re-read from /api/settings so Save cannot write the old values back; the restore confirm names the files and the credential ones; clis.json is reloaded (reloadCliRegistry) and users.json needs no restart; API reference and route docs corrected.

docs/api-reference.md

@@ -1154,18 +1154,18 @@ The result carries server **names** only, never `env` values, `headers` or file
 
 ## Config backups
 
-Timestamped snapshots of the files that hold what a user has customized (`src/config-backup.ts`). On by default; a snapshot is taken at startup and whenever the tracked files' content changes (checked every 5 minutes), so there is one entry per real change. All three routes are admin only in multi-user mode (`403`), because the files include credentials. Responses carry file names and sizes, never content.
+Timestamped snapshots of the files that hold what a user has customized (`src/config-backup.ts`). On by default; a snapshot is taken at startup and whenever the tracked files' content changes (checked every 5 minutes), so there is one entry per real change. All four routes are admin only in multi-user mode (`403`), because the files include credentials. Responses carry file names and sizes; only the diff returns values, and never a credential's.
 
-Tracked files (a fixed list, relative to the data dir): `settings.json`, `clis.json`, `custom-model-hosts.json`, `webhook.json`, `intents.json`, `linked-cases.json`, `remote-hosts.json`, `docker-hosts.json`, `docker-cases.json`, `webviews.json`, `push-keys.json`, `users.json`, `.env`. Session state (`state.json`, which also holds cron jobs and respawn presets), logs, the hook secret and caches are not.
+Tracked files (a fixed list, relative to the data dir): `settings.json`, `clis.json`, `custom-model-hosts.json`, `webhook.json`, `intents.json`, `linked-cases.json`, `remote-hosts.json`, `remote-cases.json`, `docker-hosts.json`, `docker-cases.json`, `webviews.json`, `push-keys.json`, `users.json`, `.env`. Session state (`state.json`, which also holds cron jobs and respawn presets), logs, the hook secret and caches are not.
 
-Settings (synced, in `settings.json`): `configBackupEnabled` (absent = on), `configBackupDir` (absolute path, `~` expanded; empty = `<data dir>/backups/config`), `configBackupKeepCount` (1–500, default 20), `configBackupKeepDays` (0–3650, default 30; `0` = no age limit). Retention only ever deletes snapshot folders Codeman made there, and never the newest one. Each snapshot is a `0700` folder named `cfg-YYYYMMDD-HHMMSS` (server local time; `-2`, `-3`… on a same-second collision) holding the tracked files under their own names plus a `manifest.json` (`id`, `createdAt`, `reason` of `startup`/`auto`/`manual`/`pre-restore`, `appVersion`, and a SHA-256 and size per file), all `0600`. Only folders with that name and a valid manifest are listed, restored or pruned. Full guide: `docs/wiki/Config-Backups.md`.
+Settings (synced, in `settings.json`): `configBackupEnabled` (absent = on), `configBackupDir` (absolute path, `~` expanded; empty = `<data dir>/backups/config`), `configBackupKeepCount` (1–500, default 20), `configBackupKeepDays` (0–3650, default 30; `0` = no age limit). Retention only ever deletes snapshot folders Codeman made there, and never the newest one. Each snapshot is a `0700` folder named `cfg-YYYYMMDD-HHMMSS` (server local time; `-2`, `-3`… on a same-second collision) holding the tracked files under their own names plus a `manifest.json` (`id`, `createdAt`, `reason` of `startup`/`auto`/`manual`/`pre-restore`, `appVersion`, an `origin` id, and a SHA-256 and size per file), all `0600`. Only folders with that name and a valid manifest are listed, restored or pruned. Full guide: `docs/wiki/Config-Backups.md`.
 
 | Method | Path                                 | Body | Notes                                                                                                                                                                                                                                                                                                                                                                                                                  |
 | ------ | ------------------------------------ | ---- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
 | `GET`  | `/api/config-backups`                | none | `settings` in effect, `dir`, `defaultDir`, `tracked[]` and `backups[]` (`id`, `createdAt`, `reason`, `appVersion`, `files[]`, `bytes`), newest first.                                                                                                                                                                                                                                                                  |
-| `POST` | `/api/config-backups`                | none | Snapshot now, even if nothing changed (`reason: manual`), then apply retention. `status` is `created` or `empty` (nothing tracked exists yet).                                                                                                                                                                                                                                                                         |
+| `POST` | `/api/config-backups`                | none | Snapshot now, even if nothing changed (`reason: manual`), then apply retention. `status` is `created` or `empty` (nothing tracked exists yet); `removed[]` lists the ids retention deleted. `503` when a custom folder does not answer.                                                                                                                                                                                                                                                                         |
 | `GET`  | `/api/config-backups/diff?from=&to=` | none | What differs between two states: `from`/`to` are a backup id or `current` (the running config; the default for `to`). `files[]` (`name`, `status` `added`/`removed`/`changed`/`unchanged`, `changes[]` of `path`, `kind`, `before`/`after`, `truncated`, `detail`) and `changed`. Credential values are never returned (`redacted: true`). `400` without `from`; `404` unknown id; `409` if a file fails its checksum. |
-| `POST` | `/api/config-backups/:id/restore`    | none | Put a snapshot's files back, atomically, after a `pre-restore` snapshot of the current ones. `404` unknown id; `409 CONFLICT` if a file fails its checksum (nothing changed). `restartRequired[]` names files the running server only reloads on restart.                                                                                                                                                              |
+| `POST` | `/api/config-backups/:id/restore`    | none | Put a snapshot's files back, atomically, after a `pre-restore` snapshot of the current ones. `404` unknown id; `409 CONFLICT` if a file fails its checksum (nothing changed). Returns `restored[]`, `untouched[]` (tracked files present now that the backup did not hold; left as they are), `safetySnapshot` (the `pre-restore` id) and `restartRequired[]` (files the running server only reads at start: `.env`, `push-keys.json`, `settings.json`).                                                                                                                                                              |
 
 ## Webhook notifications