feat(export): add single PDF export for sections and events with chapter ordering

packages/core/src/index.ts

@@ -3,6 +3,7 @@ export * from "./document.service";
 export * from "./search.service";
 export * from "./index.service";
 export * from "./revision.service";
+export * from "./export.service";
 export { toMeta } from "./row-map";
 
 export type {
@@ -13,5 +14,10 @@ export type {
   DocumentMeta,
   SearchHit,
   SectionInfo,
+  ExportSortOption,
+  ExportCategorySummary,
+  ExportSummary,
+  ExportData,
+  ExportQueryOptions,
 } from "@mcpedia/types";