fix(python): add stderr UTF-8 encoding for Windows compatibility

Without reconfiguring stderr, Cyrillic error messages appear garbled
on Windows (cp1251 default). Mirrors the existing stdout fix.

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

.claude/skills/db-load-cf/scripts/db-load-cf.py

@@ -32,6 +32,7 @@ def resolve_v8path(v8path):
 
 def main():
     sys.stdout.reconfigure(encoding="utf-8")
+    sys.stderr.reconfigure(encoding="utf-8")
     parser = argparse.ArgumentParser(
         description="Load 1C configuration from CF file",
         allow_abbrev=False,