security(import): wire isValidImportFilename guard into processRows

Rejects path-traversal filenames before findFileRecursive runs.
Guard runs on the derived filename (after the ternary) as specified.

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

backend/src/main/java/org/raddatz/familienarchiv/importing/MassImportService.java

@@ -291,6 +291,11 @@ public class MassImportService {
             if (index.isBlank()) continue;
 
             String filename = index.contains(".") ? index : index + ".pdf";
+            if (!isValidImportFilename(filename)) {
+                log.warn("Skipping import row {}: filename rejected — {}", i, filename);
+                skippedFiles.add(new SkippedFile(filename, "INVALID_FILENAME_PATH_TRAVERSAL"));
+                continue;
+            }
             Optional<File> fileOnDisk = findFileRecursive(filename);
             if (fileOnDisk.isEmpty()) {
                 log.warn("Datei nicht gefunden, importiere nur Metadaten: {}", filename);

backend/src/test/java/org/raddatz/familienarchiv/importing/MassImportServiceTest.java

@@ -494,6 +494,24 @@ class MassImportServiceTest {
         assertThat(result).isTrue();
     }
 
+    @Test
+    void processRows_skipsRowAndContinues_whenFilenameIsPathTraversal() {
+        when(documentService.findByOriginalFilename("legitimate.pdf")).thenReturn(Optional.empty());
+        when(documentService.save(any())).thenAnswer(inv -> inv.getArgument(0));
+
+        List<List<String>> rows = List.of(
+                List.of("header"),
+                minimalCells("../evil"),       // row 1: path traversal — should be skipped
+                minimalCells("legitimate.pdf") // row 2: valid — should be processed
+        );
+        MassImportService.ProcessResult result = ReflectionTestUtils.invokeMethod(service, "processRows", rows);
+
+        assertThat(result.processed()).isEqualTo(1);
+        assertThat(result.skippedFiles())
+                .extracting(MassImportService.SkippedFile::reason)
+                .containsExactly("INVALID_FILENAME_PATH_TRAVERSAL");
+    }
+
     // ─── importSingleDocument — non-blank optional fields ────────────────────
 
     @Test