fix(official-bots): resolve JWT verify key via MP env props (#416)

The merged rollout set JWT_PUBLIC_KEY_PATH, but the running image's
config never references it, so mp.jwt.verify.publickey.location stayed
null and every token failed with "Verification key is unresolvable".

Replace it with the MicroProfile properties the runtime reads directly
(MP_JWT_VERIFY_PUBLICKEY_LOCATION, MP_JWT_VERIFY_ISSUER), pointing at the
already-mounted ncs-jwt-keys public key. No image rebuild needed.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Reviewed-on: #416

nowchess/base/nowchess-rollouts.yaml

@@ -441,8 +441,10 @@ spec:
                   key: INTERNAL_SECRET
             - name: ACCOUNT_SERVICE_URL
               value: http://nowchess-account:8083
-            - name: JWT_PUBLIC_KEY_PATH
+            - name: MP_JWT_VERIFY_PUBLICKEY_LOCATION
               value: /secrets/jwt/public.pem
+            - name: MP_JWT_VERIFY_ISSUER
+              value: nowchess
           volumeMounts:
             - name: jwt-keys
               mountPath: /secrets/jwt