Add Kubernetes search Recipe - Bicep

Overview of the Resource type and Recipe

Radius.AI/search only has an Azure recipe today (Azure AI Search, via the AKS recipe pack). Explore a Kubernetes Recipe in Bicep.

Design consideration (please weigh in before implementing)

Azure AI Search has a proprietary REST API. In-cluster engines (OpenSearch, Elasticsearch, Meilisearch, Weaviate) speak different APIs, so apps written against Azure AI Search won't transparently work against an in-cluster backend. Decide whether this recipe is worthwhile and which engine to use.

Acceptance criteria (if we proceed)

1. A Kubernetes Bicep recipe at AI/search/recipes/kubernetes/bicep/ provisioning the chosen engine (Deployment/StatefulSet + Service + PVC).
2. Emits the Radius result object with the resource type's outputs.
3. Recipe entry added to the default Kubernetes recipe pack (recipepack/kubernetes/default-recipepack.bicep) and wired into the publish-bicep-recipes workflow matrix.
4. README; manual testing with make test-recipe.

Additional context

Example: Data/postgreSqlDatabases/recipes/kubernetes/bicep/; contribution guide docs/contributing/contributing-resource-types-recipes.md.