refactor prices schema, add missing shared files

shared/models/pagination.d.ts

@@ -0,0 +1,10 @@
+export interface PaginationMeta {
+  limit: number;
+  offset: number;
+  count: number;
+}
+
+export interface PaginatedResponse<T> {
+  data: T[];
+  meta: PaginationMeta;
+}