Log warning when perpetual license cannot be applied due to missing build date

[Copilot]

When BuildInfo.BuildDate returns null (assembly metadata not embedded), a perpetual license silently fell through to the standard expiration error with no diagnostic signal.

Changes

• LicenseValidator.cs

  • Added LogWarning when IsPerpetual is true but _buildDate is null, indicating that perpetual licensing was attempted but could not be applied due to missing BuildDateUtc assembly metadata
  • Split single constructor with ??-fallback default parameter into two overloads, allowing explicit null to be passed independently of BuildInfo.BuildDate

• LicenseValidatorTests.cs

  • Fixed build error: Validate(license, null) (non-existent overload) → Validate(license) with validator constructed using (DateTimeOffset?)null
  • Fixed bool.TrueString ("True") → "true" to match the license parser's case-sensitive comparison
  • Added assertion for the new warning log

// Before: silently added expiration error with no context
else
{
    errors.Add($"Your license ... expired {diff} days ago.");
}

// After: warns that perpetual was attempted but build date is unavailable
else
{
    if (license.IsPerpetual)
    {
        _logger.LogWarning(
            "...perpetual licensing enabled, but the build date could not be determined...");
    }
    errors.Add($"Your license ... expired {diff} days ago.");
}

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