chore(release): v1.13.1 — wellness rings fill to the actual score

The score-ring's RadialBar swept the full circle for any value because the
angular domain was only pinned on the PolarRadiusAxis (which governs radius,
not sweep). Recharts then auto-scaled the angular domain to the single datum,
so every ring read as 100%. Add a PolarAngleAxis with a fixed [0,100] number
domain so the bar sweeps value-percent of the track. Affects the overview
wellness tiles and the score-anatomy detail view.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

docs/api/openapi.yaml

@@ -1,7 +1,7 @@
 openapi: 3.1.0
 info:
   title: HealthLog API
-  version: 1.13.0
+  version: 1.13.1
   description: >-
     Self-hosted personal-health-tracking PWA — public API surface for the iOS native client and external ingest.