Add missing js-yaml runtime dependency

[MrDiscipline]

Summary

• add js-yaml as a runtime dependency because settings-manager.ts imports it at startup
• add @types/js-yaml for the TypeScript import
• update the lockfile minimally so the dependency is no longer dev-only

Fixes #17.

Verification

npm run typecheck
npm run build

I also packed this branch and installed it into a clean temporary npm project:

npm pack
npm init -y
npm install /path/to/zds-ai-cli-0.2.0-alpha.5.tgz
./node_modules/.bin/zai-cli --help
./node_modules/.bin/zai-cli --version

The packed build prints help successfully and --version prints 0.2.0-alpha.5.

For comparison, the currently published @zds-ai/cli@0.1.10 fails in a clean project with:

Error [ERR_MODULE_NOT_FOUND]: Cannot find package 'js-yaml' imported from .../node_modules/@zds-ai/cli/dist/utils/settings-manager.js

Note

npm test -- --runInBand still has an existing unrelated failure in tests/tool-call-ordering.test.ts where stripFn is not a function. This PR does not touch that code path.