- docker-compose.yml: BODY_SIZE_LIMIT=52428800 (50MB) on UI service — adapter-node was rejecting PDFs >512KB with 'Content-length exceeds limit' - storage/import.go: add AnalyzeFile() public function using real PDF/EPUB parsers - handlers_import.go: analyzeImportFile() now calls storage.AnalyzeFile() instead of the file-size stub, so chapter count is accurate in the preview