feat(garmin): sync Garmin Connect through the Personal API

Garmin Connect now offers a Personal API: a person creates a key for
their own account and any client can buy short-lived tokens with it.
HealthLog takes that key in a new Garmin card, checks it with Garmin
before storing it sealed on the user row, and polls every hour.

- Transport: key exchange with a per-process token cache keyed on the
  key, one re-exchange on a refused token and then reauth_required, the
  429 Retry-After carried to the caller, the China host tried when the
  global one does not know the key, answers read with a byte cap, all
  egress through safeFetch to the two fixed hosts.
- Sync: daily summaries, sleep summaries, HRV, weigh-ins and the
  activity search, chunked to each resource's documented range, read one
  after another and stopped at the first rate limit; today's menstrual
  cycle summary adds logged period days the person has not logged.
- Backfill: a resumable walk through the shared admission lane that
  learns where the history starts from the daily summaries and the
  activities, waits out Garmin's rate limit and stamps its marker.
- Types: GARMIN source; BODY_BATTERY and STRESS_LEVEL for Garmin's own
  day scores, kept apart from the computed STRESS_SCORE; TRAINING_READINESS
  and ACUTE_TRAINING_LOAD for figures a bridge pushes through the ingest
  token. All four chart on the recovery page and sit on the ladders,
  units, ranges, labels and report groups like the device-native scores.
- Key expiry: learned from a token capped short of a day, else estimated
  from the validity picked at connect; the card warns a week ahead and
  asks for a new key once Garmin refuses the old one.
- Ledger, health, freshness, watchdog, backup classes, wipe plan,
  encrypted-column registry, rotation script, OpenAPI and all ten
  locales carry the new integration. The old "no Garmin connector" note
  is gone.

src/__tests__/baselines/source-function-lines.json

@@ -21,7 +21,7 @@
     "app/api/export/health-record/route.ts :: apiHandler(arg)": 241,
     "app/api/ingest/medication/route.ts :: apiHandler(arg)": 259,
     "app/api/insights/cards/route.ts :: apiHandler(arg)": 211,
-    "app/api/integrations/status/route.ts :: apiHandler(arg)": 451,
+    "app/api/integrations/status/route.ts :: apiHandler(arg)": 475,
     "app/api/labs/[id]/route.ts :: apiHandler(arg) #2": 239,
     "app/api/labs/ocr/commit/route.ts :: commitOcrRows": 280,
     "app/api/labs/route.ts :: postLabResult": 242,
@@ -293,7 +293,7 @@
     "lib/insights/features.ts :: extractFeatures": 796,
     "lib/insights/mood-aggregates.ts :: fetchMoodAggregates": 246,
     "lib/insights/status-provider.ts :: runStatusCompletion": 215,
-    "lib/integrations/connection-health-load.ts :: loadConnectionFacts": 227,
+    "lib/integrations/connection-health-load.ts :: loadConnectionFacts": 229,
     "lib/integrations/status.ts :: recordSyncFailure": 292,
     "lib/jobs/apple-health-import-worker.ts :: handleAppleHealthImport": 300,
     "lib/jobs/coach-nudge.ts :: findTriggerForUser": 279,
@@ -335,7 +335,7 @@
     "lib/notifications/senders/apns.ts :: sendViaApns": 299,
     "lib/notifications/senders/web-push.ts :: sendViaWebPush": 268,
     "lib/personal-records/pr-detection-worker.ts :: detectPersonalRecordsForUser": 239,
-    "lib/personal-records/pr-direction.ts :: getPRDirection": 202,
+    "lib/personal-records/pr-direction.ts :: getPRDirection": 208,
     "lib/record-activity/activity-verb.ts :: recordActivityVerbLine": 272,
     "lib/strava/sync.ts :: runStravaSync": 219,
     "lib/support/report.ts :: collectSupportReportFacts": 332,