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refactor(validator,errutil)!: drop go.uber.org/multierr for stdlib errors.Join

Replace go.uber.org/multierr with the standard library. pkg/validator now builds its aggregate validation error by collecting the per-tag errors into a slice and calling errors.Join once, instead of accumulating them with multierr.Append; nil entries (such as the "falseif" helper tag) are dropped exactly as before, so the per-failed-tag *Error structure, count, and order are unchanged.

Add errutil.Errors, which enumerates the individual errors held in an errors.Join aggregate (nil for nil, a single-element slice for a plain error, the flattened parts for a joined error). It replaces multierr.Errors at the validator test call sites and gives callers a reusable, dependency-free extraction helper.

BREAKING CHANGE: the aggregate error returned by Validator.ValidateStruct and ValidateStructCtx now renders its combined message with newline separators (errors.Join) instead of multierr's "; ". The error type, the errors.Is/errors.As traversal, and the one-*Error-per-failed-tag structure are unchanged; only the concatenated Error() string differs.

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