fix(coach): failure and refusal messages in the app's language

[kurktchiev]

A lifter using the app in any language but English read English whenever a Coach job failed or
the server refused one. Three places:

1. JOB_ERRORS and BYOK_ERRORS in lib/coach-api.js were English literals that never went
   through t(). The chat's error bubble ("The Coach took too long and gave up.") and the toast
   on a phone with its own key were English. Every line is now a getter over t(), looked up
   when it is read. The module loads in English before any pack has arrived, so a map
   translated at load time would never follow a language switch. The lookup is still
   JOB_ERRORS[cls], so jobErrorText is unchanged.
2. A refused request (review, plan, refine, debrief) answers { error: <English words>, code: <class> }. CoachChat's composer, its quick actions and CoachIntake toasted
   e.message, the English words. They now show JOB_ERRORS[e.data?.code] first, and the
   server's words only when the class has no line: shared, which routes.js words verbatim on
   purpose because it names who can fix it. JOB_ERRORS also gains a line for unprivileged,
   the one refusal class it had none for, in the same words as USER_ERROR.unprivileged.
3. The guard in front of every Coach user route answered 503 with { error } and no class, so
   on a switched-off Coach even the change above fell through to English. It sends code: 'off'
   now, the class enqueue already throws for the same state. openapi.yaml's CoachOff
   documents it, and website/api.html is regenerated. build-api-docs.mjs has no --check on
   main yet (that is build(docs): build-api-docs gains --check, and CI runs it #342); a second run gives the same file.

15 new keys, in all 16 packs, in a new section at the end of each ("AI Coach: why a job failed or
was refused"). Busy, consent and no-workout already had keys, because the phone and demo Coach
throw them through t(). pt-BR overrides 12 of the 15; the other 3 ("not set up on this
instance", "not installed properly on this instance", "switched off on this instance for safety
reasons") read the same in both variants and inherit from pt. That moves the pt-BR inheritance
fingerprint: pt-br-inheritance-fingerprint.mjs --list differs from before only by those 3
keys (738 → 741 inherited, 965 → 977 overrides). The new lines were translated with Claude, and
no native speaker has checked them in any pack.

Tests, all passing:

• lib/coach-api.i18n.test.js, new (22). For each of the 16 packs, through setLang, every
  JOB_ERRORS and BYOK_ERRORS class has an entry, it is not the English text, and the map
  returns it. A language picked after the module loaded changes the text, and switching back
  gives English (both voices, and the provider detail still appended on a phone). It also reads
  api/coach/routes.js: The guard's 503 names a class with a line here, every class
  USER_ERROR words has a line except shared, and the unprivileged line matches the
  server's words. 21 of the 22 fail against the old coach-api.js and routes.js.
• views/CoachChat.refusal.test.jsx, new (4). The composer and a quick action toast the app's
  line for a refusal class; shared keeps the server's words; a plain network error still
  shows its message. The two class cases fail against the old CoachChat.jsx.
• CoachIntake.test.jsx +1 (34) and api/test/routes.test.js +1 (7), each failing against the
  old code. The routes test checks all seven guarded user routes, with the Coach switched off
  and with no provider connected.
• Also run: pt-br-locale.test.js (4), locale-coverage (2), i18n-core (33), coach.test.js (67),
  coach-demo (35), coach-local (11), CoachChat.test.jsx (12), CoachChat.fast-failure (4),
  CoachChat.demo-failure (1), api openapi-routes (3) and jobs (25). check-locales.mjs: 16
  locales, 1,718 keys each. check-source-strings.mjs: 1,357 strings.

Overlaps:

• Workout: save an exercise's warm-ups, rest and note back to its routine #336 and feat: an ordered session queue beside the fixed week (S.queue) — free-running order, pins, progress row (#158) #167 add lines at the end of all 16 packs and conflict there. Collapse completed workout exercises without scroll jumps #241 and Add distance logging mode (metres stored; feet for imperial) #177 already
  conflict with main at the same spot.
• feat(engine): generic prescription engine v2, smart warm-ups and v1→v2 migration #312 conflicts in openapi.yaml, 14 of the packs and the pt-BR fingerprint line.
• feat(timer): per-kind rest-over sounds, a timer bar that says what it times, self-running timed exercises #165, feat(stats): compare planned and completed weekly muscle volume #333 and fix(a11y): the workout header's menu button said "Workout view" #343 conflict only on the pt-BR fingerprint line. Whichever lands second
  re-runs the fingerprint script.

🤖 Generated with Claude Code

[DuarteSantos8]

Merged and released in v1.3.10, thanks @kurktchiev!

https://github.com/DuarteSantos8/openGym/releases/tag/v1.3.10