Put global state variables into separate state module

- Variables storing app, device state aren't constants.
  Do not mix with actual constants like empty_escape_sequence, web_directory

tests/test_client.py

@@ -8,7 +8,7 @@ import pytest
 
 # Internal Packages
 from src.main import app
-from src.utils.constants import model, config
+from src.utils.state import model, config
 from src.search_type import text_search, image_search
 from src.utils.rawconfig import ContentConfig, SearchConfig
 from src.processor.org_mode import org_to_jsonl