enhance(logging): improve feature flags configuration save error message

[arushiiii18]

Description

Improves the error message emitted when saving feature flag configuration fails.

Previously the log message only reported:

Unable to save flags configuration.

This change adds:

• the path of the configuration file that failed to save
• clarification that Safety will continue using existing or default flag values until restart
• additional context to help users understand the impact of the failure

Related to #577.

Type of Change

• Bug fix
• New feature
• Documentation update
• Refactor
• Other (logging/error message improvement)

Testing

• No tests required

This change only modifies the log message text and does not affect application behavior.

Checklist

• My code follows the project's style guidelines.
• I have reviewed my changes.
• I have tested the change locally where applicable.

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