feat(labs): link a marker to its analyte for the unit conversion

Slice 1 of phase 3 of #1095. A Biomarker row keeps only its name, so nothing
said which analyte it was. This adds the explicit alias list in the catalog the
issue settled on, including the registry-only keys (urea, blood urea nitrogen,
uric acid, total calcium, total bilirubin), and sets biomarkers.analyte_key
(from migration 0385) from it.

matchAnalyteKey equals a marker's folded name against the localised names of the
catalog seeds the registry knows and against the alias list. It matches the
whole name only, so "Calcium (ionisiert)" is not "Calcium"; a name two analytes
claim matches neither; and the marker's own unit must be one the analyte reaches,
so a marker called "Glucose" in a unit the registry cannot convert stays
unlinked.

The key is set when a marker is created (the biomarker route, the mint used by
lab writes, the legacy backfill) and, for an existing marker, by
ensureAnalyteKey the first time a reading needs it. It never overwrites a key
that is set. There is no boot job for the existing markers: the conversion that
uses the key fills it on first use, and a sweep can be added later if wanted.

The key is returned on the biomarker API and in the OpenAPI schema.

Refs #1095

src/lib/openapi/routes/biomarkers.ts

@@ -53,6 +53,7 @@ const biomarkerRow = z
     lowerBound: z.number().nullable(),
     upperBound: z.number().nullable(),
     panel: z.string().nullable(),
+    analyteKey: z.string().nullable(),
     hasContext: z.boolean(),
     context: z.string().nullable(),
     hidden: z.boolean(),
@@ -62,7 +63,7 @@ const biomarkerRow = z
   .meta({
     id: "Biomarker",
     description:
-      "A user-scoped catalog marker. `context` is the decrypted per-marker note (or null); `hasContext` flags its presence. `hidden` drops the marker from the active catalog list and the lab-entry pickers without deleting it (its readings and unit/range survive). A `LabResult` linking this marker resolves its unit + reference bounds from here.",
+      "A user-scoped catalog marker. `context` is the decrypted per-marker note (or null); `hasContext` flags its presence. `analyteKey` is the analyte the marker was recognised as (the unit-conversion registry's key, e.g. `fasting-glucose`), or null when its name matches none; a reading in another unit is converted only for a marker that has one. `hidden` drops the marker from the active catalog list and the lab-entry pickers without deleting it (its readings and unit/range survive). A `LabResult` linking this marker resolves its unit + reference bounds from here.",
   });
 
 const listResponse = z