Refactor(CLI): Centralize ov.conf JSON loading in ov doctor

[everforge]

Description

Improves ov doctor by loading ov.conf through a small shared helper that only catches OSError and json.JSONDecodeError, instead of a broad Exception. Aligns Ruff’s target-version with the package’s requires-python (3.10+). Adds unit tests for invalid JSON on embedding and VLM checks.

Related Issue

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Refactoring (no functional changes)
• Performance improvement
• Test update

Changes Made

• Added _load_config_json() in openviking_cli/doctor.py and reused it in check_embedding, check_vlm, and check_disk workspace resolution.
• Set tool.ruff target-version from py39 to py310 in pyproject.toml.
• Added test_fail_invalid_json for check_embedding and check_vlm in tests/cli/test_doctor.py.

Testing

• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have tested this on the following platforms:
  • Linux
  • macOS
  • Windows

Checklist

• My code follows the project's coding style
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published

Screenshots (if applicable)

N/A — CLI / tooling only.

Additional Notes

check_config still uses explicit JSON error messaging for the primary config validation path; only the secondary reads were deduplicated.

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All committers have signed the CLA.

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