Summary

• add a top-level flocks doctor command that reruns the source installer from the Flocks source tree
• persist installer Language in the config profile and reuse Chinese install profiles for doctor/update mirror defaults
• make install profile writes best-effort and add service diagnosis output after doctor completes

Tests

• .venv/bin/python -m pytest tests/test_install_profile.py tests/cli/test_doctor_command.py tests/cli/test_update_command.py tests/scripts/test_install_script_sources.py tests/scripts/test_powershell_scripts.py -q
• .venv/bin/ruff check flocks/cli/install_profile.py flocks/cli/commands/doctor.py flocks/cli/commands/update.py tests/test_install_profile.py tests/cli/test_doctor_command.py tests/cli/test_update_command.py
• git diff --check