chore: manage toolchain with mise

[mym0404]

Summary

• manage Node.js, Yarn, ktlint, clang-format, and SwiftFormat with pinned versions in mise.toml
• replace Corepack and setup-node with jdx/mise-action@v3
• document the mise-based local development workflow

Why

Local yarn t required native lint tools that were installed separately or inherited from the CI runner. A single mise configuration now keeps local and CI toolchains consistent.

Verification

• mise install
• yarn install --immutable
• yarn t
• GitHub Actions: lint, Android old/new, and iOS new succeeded

Type of change

• Chore
• This change requires a documentation update