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refactor(json): use range pattern in digit checks in number lexer

Replace `c >= '0' && c <= '9'` with the range pattern `c is ('0'..='9')`
across 7 sites in json/lex_number.mbt.

The range pattern desugars to the same two comparisons, so this is purely
a syntactic cleanup with no perf impact on the JSON number-lexing path.

Same idiom merged earlier in argparse (#3521 is_negative_number).

Semantics-preserving: `moon test -p json` (171/171) passes and
`moon info` produces no `.mbti` change.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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