feat: Add default rules for API and SSE HTTPRoutes

[germangarces]

The API and SSE HTTPRoute templates currently require users to provide rules explicitly via values. We should add sensible defaults (matching the Ingress behaviour) so the chart works out of the box.

API (httproute-api.yaml):

• Default path matches: /api/, /health/, /admin/, /static/admin/

SSE (httproute-sse.yaml):

• Default path match: /

The frontend HTTPRoute already defaults to /.