chore(release): v1.27.0 — Fitbit and Pixel Watch through Google Health

Add a Google Health connection that reads Fitbit, Pixel Watch, and Fitbit
Air data through the user's Google account, alongside the existing Fitbit
connection, as the path forward before the classic Fitbit Web API sunsets
in September 2026.

docs/api/openapi.yaml

@@ -1,7 +1,7 @@
 openapi: 3.1.0
 info:
   title: HealthLog API
-  version: 1.26.0
+  version: 1.27.0
   description: >-
     Self-hosted personal-health-tracking PWA — public API surface for the iOS native client and external ingest.