fix(logs): preserve subdirectory components in _validate_log_path (#2194)

[mrveiss]

Summary

• Fix _validate_log_path which used Path(file_path).name, silently dropping subdirectory components
• backend/app.log was resolving to app.log instead of LOG_DIR/backend/app.log
• Now handles both relative paths and absolute paths (strips LOG_DIR prefix)
• Path traversal protection still enforced via validate_relative_path

Test plan

• Relative subdir paths preserved: backend/app.log → LOG_DIR/backend/app.log
• Absolute paths handled: LOG_DIR/backend/app.log → strips prefix correctly
• Path traversal still rejected: ../etc/passwd → error
• Syntax verified, pre-commit hooks pass

Closes #2194

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[github-actions]

✅ SSOT Configuration Compliance: Passing

🎉 No hardcoded values detected that have SSOT config equivalents!

[mrveiss]

Closing in favor of PR #2285 which uses a cleaner approach (fixes callers + validator together).

[mrveiss]

Code review

No issues found. Checked for bugs and CLAUDE.md compliance.

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