Adds AdapterConfigSchema with three sections (Kubernetes, Resource Limits,
Scheduling) exposing: namespace, image, imagePullPolicy, kubeconfig,
resources.{requests,limits}.{cpu,memory}, nodeSelector, tolerations,
labels, ttlSecondsAfterFinished, retainJobs.
Paperclip's server fetches GET /api/adapters/:type/config-schema and
caches the result, automatically assigning ConfigFields to external
adapters. The adapter now wires getConfigSchema into createServerAdapter().
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>