fix: remove obsolete ESLint 10 --ext option

[Cherry7593]

What changed

Remove the obsolete ESLint 10 --ext option from the repository lint script.

Why

This repository uses ESLint 10 flat config, where --ext is no longer accepted. The flat config already defines TypeScript/React handling and ignores, so linting src/ preserves the same owned source scope.

Validation

• repository lint passed with the existing warnings and zero errors
• TypeScript 6 typecheck passed
• 8/8 suites and 80/80 existing tests passed
• Father ESM/CJS/declaration build and Less compile passed
• package output contained the expected 82 files

Development-script only; no runtime API changes.

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