feat(setup): advanced settings registry with remote OneCLI support

Adds a single config registry that drives both CLI flags and an opt-in
advanced-settings screen, so power users can override defaults like
remote OneCLI host/token or alt Anthropic endpoints without burdening
the standard linear flow with extra prompts.

Why: advanced configurations didn't fit cleanly into the existing
sequenced setup. PR #2030 took the "add another prompt step" route for
remote OneCLI; this approach instead routes those overrides through a
single source of truth so adding the next knob (alt endpoint, custom
host pattern, …) doesn't mean another prompt-or-skip decision.

setup/lib/setup-config.ts — schema (typed entry list with surface
'flag' | 'flag+ui'), name derivation (camelCase → NANOCLAW_UPPER_SNAKE
+ --kebab-case), seeded with --onecli-api-host, --onecli-api-token,
--anthropic-base-url, plus existing NANOCLAW_SKIP / NANOCLAW_DISPLAY_NAME
as flag-only entries.

setup/lib/setup-config-parse.ts — argv parser (--key value, --key=value,
--no-bool, -- terminator), env reader, applyToEnv() bridge that writes
resolved values back to process.env so existing step code keeps reading
env vars unchanged. Also --help printer.

setup/lib/setup-config-screen.ts — interactive menu loop. Entries
render with current value as hint; selecting one opens the right prompt
type (text / password for secrets / confirm / brightSelect for enums);
"Done" returns to the main flow.

setup/auto.ts — parses argv first (--help short-circuits before any
render), folds env+flags into process.env, then offers a welcome menu:
"Standard setup" (default) vs "Advanced". The onecli step branches on
NANOCLAW_ONECLI_API_HOST: if set, skips the local-vs-fresh prompt
entirely, runs pollHealth pre-flight, then calls runQuietStep with
--remote-url. Token, when provided, writes through to ONECLI_API_KEY in
.env. Welcome copy tightened (drops the duplicate wordmark/tagline) so
the bash → clack handoff reads as one flow.

setup/onecli.ts — cherries the --remote-url implementation from PR
run()) and generalizes writeEnvOnecliUrl into a writeEnvVar helper so
ONECLI_API_KEY follows the same upsert path.

nanoclaw.sh — forwards "$@" to setup:auto so flags reach the parser;
trims the redundant "Setting up your personal AI assistant" subtitle
and the bootstrap teach line so the pre-clack section isn't competing
with the clack intro for the same role.

Token plumbing only fires in --remote-url mode; local installs are
unauthenticated against localhost and don't need it.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

nanoclaw.sh

@@ -129,10 +129,10 @@ rm -f  "$PROGRESS_LOG"
 mkdir -p "$STEPS_DIR" "$LOGS_DIR"
 write_header
 
-# NanoClaw wordmark + subtitle — setup:auto will see NANOCLAW_BOOTSTRAPPED=1
-# and skip printing these again, so the flow stays visually continuous.
-printf '\n  %s%s\n' "$(bold 'Nano')" "$(brand_bold 'Claw')"
-printf '  %s\n\n' "$(dim 'Setting up your personal AI assistant')"
+# NanoClaw wordmark — clack's intro carries the "let's get you set up" framing,
+# so we don't print a subtitle here. setup:auto sees NANOCLAW_BOOTSTRAPPED=1 and
+# skips re-printing the wordmark, keeping the flow visually continuous.
+printf '\n  %s%s\n\n' "$(bold 'Nano')" "$(brand_bold 'Claw')"
 
 # ─── pre-flight: Homebrew on macOS ─────────────────────────────────────
 # setup/install-node.sh and setup/install-docker.sh both require `brew` on
@@ -190,7 +190,7 @@ BOOTSTRAP_START=$(date +%s)
 
 # One-line "why" that teaches a differentiator while the user waits.
 printf '%s  %s\n' "$(gray '│')" \
-  "$(dim "NanoClaw is small and runs entirely on your machine. Yours to modify.")"
+  "$(dim "Small. Runs on your machine. Yours to modify.")"
 spinner_start "$BOOTSTRAP_LABEL"
 
 # Run in the background so we can tick elapsed time. Capture exit code via
@@ -222,7 +222,7 @@ rm -f "$BOOTSTRAP_EXIT_FILE"
 BOOTSTRAP_DUR=$(( $(date +%s) - BOOTSTRAP_START ))
 
 if [ "$BOOTSTRAP_RC" -eq 0 ]; then
-  spinner_success "Basics installed" "$BOOTSTRAP_DUR"
+  spinner_success "Basics ready" "$BOOTSTRAP_DUR"
   write_bootstrap_entry success "$BOOTSTRAP_DUR" "$BOOTSTRAP_RAW"
 else
   spinner_failure "Couldn't install the basics" "$BOOTSTRAP_DUR"
@@ -259,4 +259,5 @@ fi
 # --silent suppresses pnpm's `> nanoclaw@2.0.0 setup:auto / > tsx setup/auto.ts`
 # preamble so the flow continues visually from "Basics installed" straight
 # into setup:auto's spinner. exec so signals (Ctrl-C) propagate directly.
-exec pnpm --silent run setup:auto
+# `-- "$@"` forwards any flags (e.g. --onecli-api-host) to setup:auto.
+exec pnpm --silent run setup:auto -- "$@"