Add CLI npm homepage and bugs metadata

[andycana]

Summary

Add standard npm homepage and bugs metadata to cli/package.json.

The published @openapi-codegen/cli@3.1.0 package exposes repository metadata, but npm metadata does not expose homepage or bugs fields. This change points package consumers to the CLI README and the public issue tracker.

Validation

• Direct npm registry metadata check for @openapi-codegen/cli@3.1.0
• node -e "const p=require('./cli/package.json'); if(!p.homepage?.includes('openapi-codegen/tree/main/cli#readme')) throw new Error('homepage mismatch'); if(!p.bugs?.url?.includes('fabien0102/openapi-codegen/issues')) throw new Error('bugs mismatch'); console.log(JSON.stringify({name:p.name,homepage:p.homepage,repository:p.repository,bugs:p.bugs}, null, 2));"
• git diff --check
• npm pack --dry-run --ignore-scripts from cli

Scope

Manifest metadata only. No runtime code, dependency, or lockfile changes.