feat(roles): lurker builtin template in role editor UI metadata

Reserve lurker name for custom roles and expose read-only Lurker template
in builtinRoleTemplates() for server settings parity display.

Co-authored-by: Cursor <[email protected]>

index.js

@@ -24,8 +24,8 @@ function normalizeRoleName (name) {
 function validateRoleName (name) {
   const n = normalizeRoleName(name)
   if (!n || n.length < 2) throw new Error('role name must be at least 2 characters')
-  if (/^(owner|moderator|member)$/i.test(n)) {
-    throw new Error('reserved role name — use builtin promote/demote for moderator')
+  if (/^(owner|moderator|member|lurker)$/i.test(n)) {
+    throw new Error('reserved role name — use builtin role presets in member list')
   }
   return n
 }
@@ -261,6 +261,15 @@ class PearcordGuildRoles {
         color: '#99aab5',
         permissions: ROLE_PERMISSIONS[MEMBER_ROLES.MEMBER],
         locked: true
+      },
+      {
+        id: 'builtin:lurker',
+        builtin: true,
+        name: 'Lurker',
+        color: '#72767d',
+        permissions: ROLE_PERMISSIONS[MEMBER_ROLES.LURKER],
+        locked: true,
+        hint: 'Read-only — assign a custom role to grant send permissions'
       }
     ]
   }