Resolve Clippy manual-pattern-char-comparison in JSONPath segment parsing

[Copilot]

CI was failing in the lint stage due to -D warnings enforcing clippy::manual-pattern-char-comparison in JSONPath parsing (src/json_diff/path.rs). The parser used a manual closure for delimiter matching where Clippy expects a char-pattern split.

• Problem summary

  • Clippy flagged manual char comparison in the JSONPath tokenizer (.split(|c| c == '.' || c == '[')), causing compilation to fail under strict lint settings.

• Code change

  • Updated JSONPath segment splitting to use idiomatic multi-char pattern matching:
    • from manual predicate closure
    • to array-based delimiter pattern

• Scope

  • Single-line change in Path::from_jsonpath with no behavioral expansion; parsing semantics remain aligned with existing path tokenization logic.

// before
.split(|c| c == '.' || c == '[')

// after
.split(['.', '['])

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