docs: remote desktop connect uses username/password, not --insecure + session token (#38926)

The documented path for connecting Hermes Desktop to a remote backend was
`--insecure` + a pinned HERMES_DASHBOARD_SESSION_TOKEN — an unauthenticated
bind plus a copy-pasted token. Replace it everywhere with the bundled
username/password dashboard-auth provider: set HERMES_DASHBOARD_BASIC_AUTH_*,
run `hermes dashboard --host 0.0.0.0` (the non-loopback bind engages the auth
gate), and Sign in from the app.

- desktop.md: rewrite 'Connecting to a remote backend' for the user/pass + Sign in flow
- web-dashboard.md: rewrite both remote-backend sections (overview + dedicated);
  reframe the auth-gate section so --insecure is a discouraged escape hatch, not a
  co-equal use case; drop the removed --tui flag from the systemd example
- environment-variables.md: lead with HERMES_DASHBOARD_BASIC_AUTH_*; drop the
  session-token / HERMES_DESKTOP_REMOTE_TOKEN remote-connect entries
- docker.md: mention the username/password provider as the simplest gate provider
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@ -418,21 +418,21 @@ For cloud sandbox backends, persistence is filesystem-oriented. `TERMINAL_LIFETI
### Web Dashboard & Hermes Desktop
Auth for the [web dashboard](/user-guide/features/web-dashboard) and for connecting [Hermes Desktop to a remote backend](/user-guide/features/web-dashboard#connecting-hermes-desktop-to-a-remote-backend). Per the secrets-only convention, the token belongs in `~/.hermes/.env`; the OAuth `client_id`/`portal_url` are better set under `dashboard.oauth` in `config.yaml` (env wins when set).
Auth for the [web dashboard](/user-guide/features/web-dashboard) and for connecting [Hermes Desktop to a remote backend](/user-guide/features/web-dashboard#connecting-hermes-desktop-to-a-remote-backend). Per the secrets-only convention, credentials belong in `~/.hermes/.env`; the OAuth `client_id`/`portal_url` are better set under `dashboard.oauth` in `config.yaml` (env wins when set).
The recommended way to expose a dashboard for a remote Hermes Desktop connection is the bundled **username/password** provider: set the `HERMES_DASHBOARD_BASIC_AUTH_*` vars below and run `hermes dashboard --host 0.0.0.0`. The non-loopback bind engages the auth gate, and Desktop signs in with the username and password.
| Variable | Description |
|----------|-------------|
| `HERMES_DASHBOARD_SESSION_TOKEN` | Pins the dashboard session token instead of generating a random one per boot. Set this (e.g. `openssl rand -base64 32`) on the backend, then paste the same value into Hermes Desktop → Settings → Gateway → Remote gateway → Session token. Required for a stable remote desktop connection. |
| `HERMES_DESKTOP_REMOTE_URL` | (Desktop side) Base URL of the remote backend, e.g. `http://host:9119`. When set, overrides the in-app Gateway settings. Must be paired with `HERMES_DESKTOP_REMOTE_TOKEN`. |
| `HERMES_DESKTOP_REMOTE_TOKEN` | (Desktop side) The session token to authenticate with the remote backend — the same value as the backend's `HERMES_DASHBOARD_SESSION_TOKEN`. |
| `HERMES_DASHBOARD_BASIC_AUTH_USERNAME` | Username for the bundled username/password dashboard-auth provider (`plugins/dashboard_auth/basic`). Activates the provider when set together with a password. Overrides `dashboard.basic_auth.username`. |
| `HERMES_DASHBOARD_BASIC_AUTH_PASSWORD` | Plaintext password for the basic provider (hashed in-memory at load). Wins over a config `password_hash` so you can rotate via env. Overrides `dashboard.basic_auth.password`. |
| `HERMES_DASHBOARD_BASIC_AUTH_PASSWORD_HASH` | scrypt password hash for the basic provider (preferred — no plaintext at rest). Compute with `python -c "from plugins.dashboard_auth.basic import hash_password; print(hash_password('PW'))"`. Overrides `dashboard.basic_auth.password_hash`. |
| `HERMES_DASHBOARD_BASIC_AUTH_SECRET` | HMAC key (32+ bytes, base64/hex/raw) signing the basic provider's stateless session tokens. Set explicitly so sessions survive restarts / span multiple workers; blank → random per-process (you'll be logged out on every restart). Overrides `dashboard.basic_auth.secret`. |
| `HERMES_DASHBOARD_BASIC_AUTH_TTL_SECONDS` | Access-token lifetime for the basic provider (default 12h). Overrides `dashboard.basic_auth.session_ttl_seconds`. |
| `HERMES_DESKTOP_REMOTE_URL` | (Desktop side) Base URL of the remote backend, e.g. `http://host:9119`. When set, overrides the in-app Gateway URL; you still sign in with your username and password from the Gateway settings panel. |
| `HERMES_DASHBOARD_OAUTH_CLIENT_ID` | OAuth client id (`agent:{instance_id}`) for the gated/public dashboard. Overrides `dashboard.oauth.client_id`. Provisioned by the Nous Portal for hosted deploys. |
| `HERMES_DASHBOARD_PORTAL_URL` | OAuth portal URL (default: `https://portal.nousresearch.com`). Override only for staging/custom deploys. |
| `HERMES_DASHBOARD_PUBLIC_URL` | Complete public URL the dashboard is reached at, for OAuth callback construction behind reverse proxies. Overrides `dashboard.public_url`. |
| `HERMES_DASHBOARD_BASIC_AUTH_USERNAME` | Username for the bundled username/password dashboard-auth provider (`plugins/dashboard_auth/basic`). Activates the provider when set together with a password. Overrides `dashboard.basic_auth.username`. |
| `HERMES_DASHBOARD_BASIC_AUTH_PASSWORD_HASH` | scrypt password hash for the basic provider (preferred — no plaintext at rest). Compute with `python -c "from plugins.dashboard_auth.basic import hash_password; print(hash_password('PW'))"`. Overrides `dashboard.basic_auth.password_hash`. |
| `HERMES_DASHBOARD_BASIC_AUTH_PASSWORD` | Plaintext password for the basic provider (hashed in-memory at load). Wins over a config `password_hash` so you can rotate via env. Overrides `dashboard.basic_auth.password`. |
| `HERMES_DASHBOARD_BASIC_AUTH_SECRET` | HMAC key (32+ bytes, base64/hex/raw) signing the basic provider's stateless session tokens. Set explicitly for restart-surviving / multi-worker sessions; blank → random per-process. Overrides `dashboard.basic_auth.secret`. |
| `HERMES_DASHBOARD_BASIC_AUTH_TTL_SECONDS` | Access-token lifetime for the basic provider (default 12h). Overrides `dashboard.basic_auth.session_ttl_seconds`. |
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