Add Kubernetes sqlServerDatabases Recipe - Bicep

Overview of the Resource type and Recipe

Radius.Data/sqlServerDatabases has no in-cluster Kubernetes recipe. #15 tracks the Terraform variant; this issue covers the Kubernetes Bicep recipe.

Acceptance criteria

1. A Kubernetes Bicep recipe at Data/sqlServerDatabases/recipes/kubernetes/bicep/ provisioning SQL Server in-cluster (mcr.microsoft.com/mssql/server: Deployment + Service + PVC), mapping database.
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

Related: #15 (Kubernetes SQL - Terraform), #17 (Azure SQL - Terraform). Example: Data/postgreSqlDatabases/recipes/kubernetes/bicep/; contribution guide docs/contributing/contributing-resource-types-recipes.md.