`hermes portal` / `hermes setup --portal` previously logged in and set
provider=nous but left the model UNSELECTED (blank -> runtime default) and
never showed a picker — unlike the first-time quick setup, which runs the
model picker.
Route `_run_portal_one_shot` through `_model_flow_nous` — the exact same
routine quick setup (`_run_first_time_quick_setup`) and `hermes model` -> Nous
use. It handles both the logged-out path (device-code OAuth, which picks a
model internally) and the logged-in path (curated Nous model picker), then
offers the Tool Gateway opt-in and sets provider=nous. Net effect: `hermes
portal` now offers a model picker every time and is a true single-command
collapse of quick setup's Nous step.
Removes the hand-rolled auth_add_command + manual provider write + separate
Tool Gateway prompt (now a single source of truth). Re-syncs the in-memory
config from disk afterward so a caller's later save_config can't clobber the
model/provider written by the login flow.
Docs (CLI help, portal_cli docstrings, nous-portal EN + zh-Hans) updated to
mention model selection. New regression test asserts `_run_portal_one_shot`
delegates to `_model_flow_nous`.
Verified live: `hermes portal` now shows the 27-model curated picker, 'Skip
(keep current)' preserves prior provider/model.
cd188b814e