fix: clean up type annotations and unused imports

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

tests/test_daemon.py

@@ -1,7 +1,5 @@
-import os
-import tempfile
 import pytest
-from unittest.mock import patch, MagicMock
+from unittest.mock import patch
 from jianda_proxy.daemon import (
     read_pid,
     write_pid,

tests/test_proxy.py

@@ -1,8 +1,4 @@
-import threading
-import http.client
-import time
 import pytest
-from unittest.mock import MagicMock, patch
 from jianda_proxy.proxy import create_server