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

examples/hello-go/job.tf

@@ -0,0 +1,28 @@
+# 2026-03-11
+# job.tf — одноразовый запуск Go функции с event payload.
+
+resource "sless_function" "hello_go_job" {
+  name        = "hello-go-job"
+  runtime     = "go1.23"
+  entrypoint  = "handler.Handle"
+  memory_mb   = 128
+  timeout_sec = 60
+
+  source_dir = "${path.module}/code"
+}
+
+resource "sless_job" "hello_go_run" {
+  name             = "hello-go-run"
+  function         = sless_function.hello_go_job.name
+  event_json       = jsonencode({ name = "Go" })
+  wait_timeout_sec = 300
+  run_id           = 1
+}
+
+output "job_phase" {
+  value = sless_job.hello_go_run.phase
+}
+
+output "job_message" {
+  value = sless_job.hello_go_run.message
+}