Add a user-scoped Biomarker catalog so a marker is defined once — name,
unit, lower/upper bound, optional encrypted context, panel — and every
later reading just links it. New /api/biomarkers CRUD plus a structured
/api/labs create path: a biomarkerId resolves the unit + reference range
server-side, so the list and detail DTOs carry the resolved values and
the client never recomputes the range. Lab reads include the linked
marker and fall back to the legacy free-text fields for unlinked rows.
Add a lab-result restore endpoint for the delete-Undo affordance, a
shared serialiser, a static common-panel seed list, and tests for
catalog validation, structured-entry resolution, and the context codec.
