feat: go1.23 runtime support

- runtimes/go1.23/server.go: HTTP-wrapper + job-runner (SLESS_MODE=job)
- runtimes/go1.23/go.mod: module sless/fn (изолирует от корневого go.mod)
- runtimes/go1.23/Dockerfile: multi-stage build (golang:1.23-alpine → alpine:3.20)
- internal/builder/context.go: go1.23 в runtimeBaseImage + generateDockerfile
- controllers/functionjob_controller.go: go1.23 runner (nil cmd + SLESS_MODE=job env)
- api/v1alpha1/function_types.go: enum go1.21 → go1.23
- config/crd/bases/...: CRD обновлён
- terraform/provider: OneOf обновлён
- examples/hello-go: HTTP + job примеры на go1.23
- deployments/k8s/operator.yaml: v0.1.25

terraform/provider/internal/resources/function_resource.go

@@ -97,7 +97,7 @@ func (r *FunctionResource) Schema(_ context.Context, _ resource.SchemaRequest, r
 					stringplanmodifier.RequiresReplace(),
 				},
 				Validators: []validator.String{
-					stringvalidator.OneOf("nodejs20", "python3.11", "go1.21"),
+					stringvalidator.OneOf("nodejs20", "python3.11", "go1.23"),
 				},
 			},
 			"entrypoint": schema.StringAttribute{