feat(avatar): show multi-file knowledge upload progress

digital-avatar-app/backend/routers/knowledge.py

@@ -102,6 +102,8 @@ async def upload_doc(avatar_id: str, file: UploadFile = File(...), authorization
         file_size=file_size,
         file_url=f"/api/files/{avatar_id}/{stored}",
         status="parsing",
+        index_stage="queued",
+        index_progress=0,
     )
 
     # Persist and acknowledge the upload first. Extraction and embeddings may take
@@ -134,6 +136,8 @@ def retry_doc(avatar_id: str, doc_id: str, authorization: str = Header(None), db
     doc.chunk_count = 0
     doc.vectorized_at = None
     doc.error_message = ""
+    doc.index_stage = "queued"
+    doc.index_progress = 0
     db.commit()
     db.refresh(doc)
     knowledge_vectorizer.enqueue(doc.id)