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Remove iterator base() for input-only ranges

The transcoding iterator's base() member is not meaningful for input
ranges since the underlying iterator has already been consumed past the
current code point. Constrain base() with forward_range so it is not
provided at all when the base range is input-only.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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