fix(appointment): stop insurance select crash and use current endpoint

DefaultSelect passed options={undefined} to MUI Autocomplete while the
insurance lists were still loading (or failed), throwing 'Cannot read
properties of undefined (reading length)'. Default options to [].

The old categorys/insurance_type + supplementary_insurance routes were
removed server-side (ERR_MOVED), so the lists never loaded. Point
getInsuranceType/getSupplementaryInsurance at the current
/api/v1/insurances?type=basic|supplementary (authed; the booking detail
step and dashboard are both logged-in), returning a flat data array.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

app/component/selectors/DefaultSelect.js

@@ -6,7 +6,7 @@ function DefaultSelect({ list, value, updateData, label, error, name }) {
   return (
     <Autocomplete
       disablePortal
-      options={list}
+      options={Array.isArray(list) ? list : []}
       value={value || ""}
       getOptionLabel={(option) => {
         if (typeof option === "string") return option;