feat(ip): protect persona 'formula' — secret fields only super_admin sees/edits

IP protection so casual copying yields inferior results:
- SECRET_PERSONA_FIELDS (pains/objections/negotiation_levers/opener/tolerance +
  pain rootCause/resolutionConditions): only super_admin can view/edit them.
- list_personas/get_persona/update_persona/get_group strip these for role=admin (and
  hide sales_kit + pain-fit report from admins too).
- update_persona rejects admin attempts to set secret fields (403).
- PersonaForm hides the 'การขาย' recipe section for non-super-admin (shows locked note);
  auth.isSuperAdmin getter added.
Rebuilt dist. Added test_ip_protection.

frontend/dist/assets/arrow-left-diPpM4Dj.js

@@ -0,0 +1,6 @@
+import{c as e}from"./index-BCax2GDh.js";/**
+ * @license lucide-vue-next v1.0.0 - ISC
+ *
+ * This source code is licensed under the ISC license.
+ * See the LICENSE file in the root directory of this source tree.
+ */const t=e("arrow-left",[["path",{d:"m12 19-7-7 7-7",key:"1l729n"}],["path",{d:"M19 12H5",key:"x3x0zl"}]]);export{t as A};