chore(release): v1.28.2 — automatic AI document reading (opt-in)

One opt-in in AI settings reads every uploaded document with the configured
provider — no per-document tap. Off by default; the vault stays local-first
otherwise. Scanned PDFs and photos are read too (a PDF's pages are rendered to
images so an image-only provider can read them). The background indexer now
follows the same opt-in, so nothing leaves the machine automatically unless it
is enabled.

docs/api/openapi.yaml

@@ -1,7 +1,7 @@
 openapi: 3.1.0
 info:
   title: HealthLog API
-  version: 1.28.1
+  version: 1.28.2
   description: >-
     Self-hosted personal-health-tracking PWA — public API surface for the iOS native client and external ingest.