docs: remove stale ExcelService from CLAUDE.md

ExcelService was deleted in fa60c5be. Both the root and backend
CLAUDE.md still listed it under importing/ and in the services table.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

CLAUDE.md

@@ -78,7 +78,7 @@ backend/src/main/java/org/raddatz/familienarchiv/
 ├── exception/           DomainException, ErrorCode, GlobalExceptionHandler
 ├── filestorage/         FileService (S3/MinIO)
 ├── geschichte/          Geschichte (story) domain
-├── importing/           MassImportService, ExcelService
+├── importing/           MassImportService
 ├── notification/        Notification domain + SseEmitterRegistry
 ├── ocr/                 OCR domain — OcrService, OcrBatchService, training
 ├── person/              Person domain
@@ -156,7 +156,6 @@ Services are annotated with `@Service`, `@RequiredArgsConstructor`, and optional
 | `UserService` | User and group CRUD |
 | `FileService` | S3/MinIO upload and download |
 | `MassImportService` | Async ODS/Excel import; delegates to PersonService and TagService |
-| `ExcelService` | Lower-level spreadsheet parsing |
 
 ### DTOs
 

backend/CLAUDE.md

@@ -33,7 +33,7 @@ src/main/java/org/raddatz/familienarchiv/
 ├── exception/           # DomainException, ErrorCode, GlobalExceptionHandler
 ├── filestorage/         # FileService (S3/MinIO)
 ├── geschichte/          # Geschichte (story) domain
-├── importing/           # MassImportService, ExcelService
+├── importing/           # MassImportService
 ├── notification/        # Notification domain + SseEmitterRegistry
 ├── ocr/                 # OCR domain — OcrService, OcrBatchService, training
 ├── person/              # Person domain — Person, PersonService, PersonController