Add member identifiers table for ID documents (DL, passport, school ID)

member_identifier table with type, value, issuing authority, expiry,
front/back image storage (base64 in Postgres), primary flag. CRUD
endpoints under /members/:memberId/identifiers. Zod schemas with
constrained type enum.

packages/shared/src/schemas/index.ts

@@ -13,6 +13,8 @@ export {
   MemberCreateSchema,
   MemberUpdateSchema,
   AccountSearchSchema,
+  MemberIdentifierCreateSchema,
+  MemberIdentifierUpdateSchema,
   ProcessorLinkCreateSchema,
   ProcessorLinkUpdateSchema,
   PaymentMethodCreateSchema,
@@ -27,6 +29,8 @@ export type {
   AccountUpdateInput,
   MemberCreateInput,
   MemberUpdateInput,
+  MemberIdentifierCreateInput,
+  MemberIdentifierUpdateInput,
   ProcessorLinkCreateInput,
   ProcessorLinkUpdateInput,
   PaymentMethodCreateInput,