build: migrate to esm, vitest & oxlint

[SocketSomeone]

Please describe the changes this PR makes and why it should be merged:

Migrate the TypeScript open-source template to the canonical Necord TypeScript 7 toolchain:

• publish native ESM with explicit root and package.json exports, a dist-only files allowlist, and the supported Node/npm engine range
• separate TypeScript typechecking from build emit
• replace ESLint configuration with the approved canonical Oxlint profile while preserving Prettier and the JS plugins Oxlint uses
• replace Jest and ts-jest completely with canonical Vitest configuration using passWithNoTests for this zero-test template
• run install, lint, typecheck, build, and Vitest across the supported Node matrix in CI

No tests, fixtures, package-smoke scripts, or migration helpers were added.

Status and versioning classification:

Breaking build/package-tooling change: the template now emits and advertises native ESM and requires Node ^20.19.0 or >=22.13.0.

Verification from Node v24.20.0 / npm 11.19.0:

• npm install --package-lock-only --ignore-scripts — exit 0

• npm ci — exit 0; 397 packages installed, 398 audited

• npm run lint — exit 0; 0 warnings/errors

• npm run typecheck — exit 0

• npm run build — exit 0; dist/index.js and dist/index.d.ts emitted

• npm test — exit 0; no test files found as expected

• npm run test:ci — exit 0; no test files found as expected, V8 coverage 100% of 0/0

• npm pack --dry-run --json — exit 0; 5 package entries, limited to LICENSE, README.md, dist output, and package.json

• git diff --check — exit 0

• canonical config parity checks — exit 0 for .oxlintrc.json, vitest.config.mts, tsconfig.json, and tsconfig.build.json

• added test-file check — 0 test/spec files added

• npm audit --json — exit 1 due to one pre-existing high-severity js-yaml@4.3.0 dev-only advisory already present at the base SHA; no audit fix is included in this focused migration

• There are no application source code changes

• Typings/build metadata have been updated

• This PR includes breaking package/tooling changes

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commit: 495622a