feat: add serviceAccountName field to config schema

Surface SA assignment in the Kubernetes section of the adapter UI.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "@farhoodliquor/paperclip-adapter-claude-k8s",
-  "version": "0.1.20",
+  "version": "0.1.21",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@farhoodliquor/paperclip-adapter-claude-k8s",
-      "version": "0.1.20",
+      "version": "0.1.21",
       "license": "MIT",
       "dependencies": {
         "@kubernetes/client-node": "^1.0.0",