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Backend: - Add ANNOTATE_ALL permission - Add ANNOTATION_NOT_FOUND and ANNOTATION_OVERLAP error codes - V10 migration: document_annotations table with page/rect/color/owner - DocumentAnnotation entity, AnnotationRepository, CreateAnnotationDTO - AnnotationService: overlap detection (rectangle intersection), ownership enforcement on delete - AnnotationController: GET (authenticated), POST/DELETE (ANNOTATE_ALL) - 15 new tests (AnnotationServiceTest, AnnotationControllerTest) — TDD red/green Frontend: - AnnotationLayer.svelte: pointer-event drawing, colored rect overlays, delete buttons - PdfViewer.svelte: annotate toggle, color picker, loads/saves/deletes annotations via API - Disabled annotate button with tooltip for users without ANNOTATE_ALL - canAnnotate exposed from layout server, passed to PdfViewer - errors.ts + de/en/es translations for new error codes - 3 new unit tests for AnnotationLayer — TDD red/green Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>