fix(ocr): remove misleading ANALYZING progress before streaming starts

The ANALYZING message appeared while the Python service was still
downloading the PDF and loading models. Remove it so the LOADING
message ("Lade Modell und Dokument…") stays visible until the first
ANALYZING_PAGE event arrives from the stream.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

backend/src/main/java/org/raddatz/familienarchiv/service/OcrAsyncRunner.java

@@ -54,8 +54,6 @@ public class OcrAsyncRunner {
             clearExistingBlocks(documentId);
             String pdfUrl = fileService.generatePresignedUrl(doc.getFilePath());
 
-            updateProgress(job, "ANALYZING");
-
             AtomicInteger blockCounter = new AtomicInteger(0);
             AtomicInteger currentPage = new AtomicInteger(0);
             AtomicInteger skippedPages = new AtomicInteger(0);