fix: Build errors and tesseract removal

ocr/tests/test_health.py

@@ -39,14 +39,9 @@ def test_pillow_heif_can_register():
     assert "HEIF" in Image.registered_extensions().values()
 
 
-def test_tesseract_available():
-    """Tesseract OCR is available and can process images."""
-    import pytesseract
+def test_paddleocr_engine_available():
+    """PaddleOCR engine can be created."""
+    from app.engines.paddle_engine import PaddleOcrEngine
 
-    # Create a simple test image with text
-    img = Image.new("RGB", (200, 50), color="white")
-
-    # Verify pytesseract can call tesseract (will return empty string for blank image)
-    result = pytesseract.image_to_string(img)
-    # Just verify it doesn't raise an exception - blank image returns empty/whitespace
-    assert isinstance(result, str)
+    engine = PaddleOcrEngine()
+    assert engine.name == "paddleocr"