fix(labs): remove BUN aliases from urea, correct DHEA-S molar mass

server/src/lib/analytes.ts

@@ -85,7 +85,7 @@ export const ANALYTES: Analyte[] = [
     key: "dhea_s",
     display: "DHEA-S",
     canonicalUnit: "µmol/L",
-    molarMass: 384.5,
+    molarMass: 368.49,
     panel: "hormones",
     aliases: ["dhea-s", "dhea s", "dheas", "dehydroepiandrosterone sulfate"],
   },
@@ -347,7 +347,12 @@ export const ANALYTES: Analyte[] = [
     canonicalUnit: "mmol/L",
     molarMass: 60.06,
     panel: "kidney",
-    aliases: ["urea", "bun", "blood urea nitrogen"],
+    // Deliberately no "bun"/"blood urea nitrogen" aliases: BUN mg/dL -> urea
+    // mmol/L needs the nitrogen divisor (2N = 28.01 g/mol), not urea's own
+    // molar mass (60.06). Mapping BUN here would silently under-convert by
+    // ~2.14x. BUN rows stay unmapped (raw value preserved) until a proper
+    // BUN analyte with its own divisor is added.
+    aliases: ["urea"],
   },
 
   // --- cbc ---