dev: Add test setup and pre-commit linting

[isTravis]

Add test suite, CI pipeline, and formatting enforcement

Testing

• Added Vitest with happy-dom and @testing-library/react (per canonical stack)
• Created vitest.config.ts with ~/ path alias and happy-dom environment
• Added pnpm test / pnpm test:watch scripts
• Unit tests for route-gen.ts — filesystem route conversion, dynamic params, sort ordering
• Unit tests for src/lib/ark.ts — NCDA check digits, ARK ID minting, path parsing/roundtripping, ERC formatting

CI

• New .github/workflows/ci.yml — runs lint, typecheck, and tests on every push/PR to main
• Updated .github/workflows/deploy.yml — deploy now triggers via workflow_run after CI passes (instead of directly on push). Manual dispatch and releases bypass the gate.

Formatting

• Fixed dprint.json — added missing plugins array (TypeScript, JSON, CSS via Malva)
• Added pre-commit hook via simple-git-hooks + lint-staged — auto-formats staged files on commit