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/book-open-C7SxBVkN.js

@@ -0,0 +1,6 @@
+import{c as a}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 e=a("book-open",[["path",{d:"M12 7v14",key:"1akyts"}],["path",{d:"M3 18a1 1 0 0 1-1-1V4a1 1 0 0 1 1-1h5a4 4 0 0 1 4 4 4 4 0 0 1 4-4h5a1 1 0 0 1 1 1v13a1 1 0 0 1-1 1h-6a3 3 0 0 0-3 3 3 3 0 0 0-3-3z",key:"ruj8y"}]]);export{e as B};