test: ungenutzte imports entfernen (ruff F401)

tests/test_chunker.py

@@ -1,4 +1,4 @@
-from app.ingest.chunker import chunk_text, Chunk
+from app.ingest.chunker import chunk_text
 
 
 def test_chunk_short_text_single_chunk():

tests/test_embedder.py

@@ -1,4 +1,3 @@
-import asyncio
 from unittest.mock import AsyncMock, MagicMock, patch
 import pytest
 

tests/test_extractors.py

@@ -1,5 +1,5 @@
 import pytest
-from app.ingest.extractors import extract, ExtractedPage, UnsupportedFileType
+from app.ingest.extractors import extract, UnsupportedFileType
 
 
 def test_extract_pdf_returns_pages(sample_pdf_bytes):