feat(api): report the live title and the client's command line to the dashboard

docs/dev/rest-api/dashboard.md

@@ -44,7 +44,7 @@ All are `GET`.
 | Path | Returns |
 |------|---------|
 | `/api/dashboard/status` | Version, `code_hash`, bind host and port, `mode` (`full`, `api_only`, `remote_only`), uptime, `requests_total`, `requests_rejected` (401s), `requests_by_key` (label → count), loaded service count, session count, `max_sessions` (`null` when the operator configured no limit), `session_ttl`, job counts by status. The service count includes services that failed to import - use `/api/dashboard/services` for the number that loaded. |
-| `/api/dashboard/sessions` | Every live remote session: `id`, `owner` (username or masked key), `creator_ip`, `service`, `title_id`, `titles`, `tracks`, `title` (the first resolved title's display name), `auth_status`, `auth_error`, `server_account` (the server profile lent to the remote session, else `null`), `client`, `actions`, `created_at` and `last_accessed` (ISO 8601) with `created_ts` and `last_accessed_ts` (Unix epoch, the same clock as log `ts`), `age_seconds`, `idle_seconds`, `log_seq`. `client` is whatever the remote client sent as `client` in its session create request: the CLI sends `version` and `platform`, an older client sends nothing and the field is `{}`. `log_seq` is the last sequence number in the remote session's service log - poll `/api/dashboard/sessions/{id}/logs` when it changes. `actions` is the session's request log, newest last, capped at 500: `ts`, `method`, `action` (`titles`, `tracks`, `segments`, `license`, `prompt`, …), `query`, `status`, `ms`, `bytes_in`, `bytes_out`. |
+| `/api/dashboard/sessions` | Every live remote session: `id`, `owner` (username or masked key), `creator_ip`, `service`, `title_id`, `titles`, `tracks`, `title` (the display name of the title the client is on: the last one it asked tracks for, else the first resolved title), `auth_status`, `auth_error`, `server_account` (the server profile lent to the remote session, else `null`), `client`, `actions`, `created_at` and `last_accessed` (ISO 8601) with `created_ts` and `last_accessed_ts` (Unix epoch, the same clock as log `ts`), `age_seconds`, `idle_seconds`, `log_seq`. `client` is whatever the remote client sent as `client` in its session create request. The CLI sends `version`, `code_hash` (the commit the client runs, `null` when its source cannot be read), `platform` and `argv`. `argv` is the command line the user ran: proxy and URL userinfo, secret query parameters and credential values become `***`, home and install paths shorten as in the logs, and the line is cut at 3000 characters. An older client sends less or nothing and the field is `{}`. `log_seq` is the last sequence number in the remote session's service log - poll `/api/dashboard/sessions/{id}/logs` when it changes. `actions` is the session's request log, newest last, capped at 500: `ts`, `method`, `action` (`titles`, `tracks`, `segments`, `license`, `prompt`, …), `query`, `status`, `ms`, `bytes_in`, `bytes_out`. |
 | `/api/dashboard/jobs` | Every download job with full detail, regardless of owner. Empty in `--remote-only` mode. |
 | `/api/dashboard/logs` | `{"seq": N, "records": [...]}`: the last 1000 log records. `?since=<seq>` returns only newer records; `?level=WARNING` sets the minimum level; `?logger=serve` keeps one logger and its children (`aiohttp.access` is the noisiest). `ts` is a Unix epoch in seconds. |
 | `/api/dashboard/sessions/{id}/logs` | One remote session's service log: `{"session_id", "last_seq", "records": [...]}`. Each record has `seq`, `ts`, `level`, `message`. `?since=<seq>` returns only newer records. 404 when the remote session is unknown. |

docs/dev/rest-api/endpoints.md

@@ -854,7 +854,7 @@ DELETE /api/session/{id}        → tear down, harvest updated cache
 
 ### `POST /api/session/create`
 
-Make a remote session for a service and title. Authentication runs asynchronously in the background. This call returns immediately with `status: "authenticating"`, and you then poll the prompt endpoint. The body accepts `service` and `title_id` (both required). It also accepts a broad set of optional keys, because the body allows `additionalProperties`. These are `credentials` (`{username, password, extra?}`), `cookies` (base64 of zlib-compressed Netscape cookie file), `proxy`, `no_proxy`, `profile`, `cache` (map of forwarded cache files), `client_region`, `proxy_region`, `cdm_type`, `range_`, `vcodec`, `quality`, `best_available`, and any service CLI options. `proxy_region` is the country code the client resolved `proxy` from; the server matches it against its own accounts.
+Make a remote session for a service and title. Authentication runs asynchronously in the background. This call returns immediately with `status: "authenticating"`, and you then poll the prompt endpoint. The body accepts `service` and `title_id` (both required). It also accepts a broad set of optional keys, because the body allows `additionalProperties`. These are `credentials` (`{username, password, extra?}`), `cookies` (base64 of zlib-compressed Netscape cookie file), `proxy`, `no_proxy`, `profile`, `cache` (map of forwarded cache files), `client_region`, `proxy_region`, `cdm_type`, `range_`, `vcodec`, `quality`, `best_available`, `client`, and any service CLI options. `proxy_region` is the country code the client resolved `proxy` from; the server matches it against its own accounts. `client` is a freeform object the dashboard shows as sent (the CLI puts `version`, `code_hash`, `platform` and a redacted `argv` in it); the server ignores it above 4096 bytes of JSON.
 
 Service CLI options also travel in a nested `service_params` object, which wins over a flat key with the same name. `profile` at the top level always means the credentials profile, never a service's own `--profile` option.
 

docs/dev/rest-api/remote-sessions.md

@@ -324,7 +324,8 @@ The server mounts all these routes, even in `--remote-only` mode. Paths use the
 `POST /api/session/create` requires `service` and `title_id`. It also accepts
 `credentials`, `cookies` (base64 of zlib-compressed Netscape cookie file), `proxy`,
 `no_proxy`, `profile`, `cache` (a map of `filename → base64(zlib(bytes))`),
-`client_region`, `cdm_type`, and the track-selection hints `range_`, `vcodec`,
+`client_region`, `cdm_type`, `client` (a freeform identity object the dashboard
+shows as sent), and the track-selection hints `range_`, `vcodec`,
 `quality`, `best_available`, plus arbitrary service CLI options
 (`additionalProperties: true`).