style: sort Python imports with isort

Add isort configuration (profile=black, line_length=100) to pyproject.toml,
add isort pre-commit hook, and auto-sort imports across all Python source files.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

python/tests/test_schematic_component_fields.py

@@ -3,8 +3,8 @@ Tests for get_schematic_component and edit_schematic_component fieldPositions su
 """
 
 import re
-import sys
 import shutil
+import sys
 import tempfile
 from pathlib import Path