fix(measurements): wire the six deferred Apple Health identifiers

Adds RESPIRATORY_RATE, BODY_MASS_INDEX, and the four remaining
deferred quantity types to MeasurementType plus the Apple Health
mapping. The batch route already returns 200 with a per-entry skip
for unmappable identifiers; iOS reads that as success and advances
its sync anchor, so any sample with one of these identifiers used
to be dropped forever. The mapping now accepts them and the rows
land.

The walking-asymmetry and walking-double-support percent values
adopt the project's server-side scaling convention (raw HK reading
on the wire, server applies the ×100 at ingest), matching the
walking-steadiness path. iOS releases that still send the
pre-multiplied percent need a one-release shim and are tracked in
the iOS coord notes.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

docs/api/openapi.yaml

@@ -1,7 +1,7 @@
 openapi: 3.1.0
 info:
   title: HealthLog API
-  version: 1.5.3
+  version: 1.5.4
   description: >-
     Self-hosted personal-health-tracking PWA — public API surface for the iOS native client and external ingest.
 
@@ -170,6 +170,12 @@ paths:
               - TIME_IN_DAYLIGHT
               - WALKING_STEADINESS
               - AUDIO_EXPOSURE_EVENT
+              - RESPIRATORY_RATE
+              - BODY_MASS_INDEX
+              - LEAN_BODY_MASS
+              - WALKING_HEART_RATE_AVERAGE
+              - WALKING_ASYMMETRY
+              - WALKING_DOUBLE_SUPPORT
         - in: query
           name: from
           schema:
@@ -295,6 +301,12 @@ paths:
                     - TIME_IN_DAYLIGHT
                     - WALKING_STEADINESS
                     - AUDIO_EXPOSURE_EVENT
+                    - RESPIRATORY_RATE
+                    - BODY_MASS_INDEX
+                    - LEAN_BODY_MASS
+                    - WALKING_HEART_RATE_AVERAGE
+                    - WALKING_ASYMMETRY
+                    - WALKING_DOUBLE_SUPPORT
                 value:
                   type: number
                 measuredAt:
@@ -2222,6 +2234,12 @@ components:
             - TIME_IN_DAYLIGHT
             - WALKING_STEADINESS
             - AUDIO_EXPOSURE_EVENT
+            - RESPIRATORY_RATE
+            - BODY_MASS_INDEX
+            - LEAN_BODY_MASS
+            - WALKING_HEART_RATE_AVERAGE
+            - WALKING_ASYMMETRY
+            - WALKING_DOUBLE_SUPPORT
         value:
           type: number
         unit: