Replace deprecated `fs.extra` with `fs-extra` in generator and hooks packages

[wei123-web]

Bug: deprecated dependency used in core packages

The monorepo currently depends on fs.extra@1.3.2, which is deprecated and no longer commonly maintained. The actively maintained package is fs-extra.

I verified usage locally with:
npm ls fs.extra

Locations where fs.extra is used
Production code:

apps/generator/lib/generator.js
apps/generator/lib/hooksRegistry.js

Test code:

apps/generator/test/cli.js
apps/generator/test/generator.test.js

Dependency declarations:

apps/generator/package.json
apps/hooks/package.json

Why this matters:

• deprecated dependency risk
• potential compatibility issues with modern Node versions
• contributor confusion
• ecosystem maintenance concern

Proposed solution:

• replace fs.extra with fs-extra
• update imports if needed
• run tests to confirm no behavioral change

I’m happy to work on this if approved.