Local AI: a page to set up AI spam filtering, and the form hooks the spec asks for

Settings › Spam Filter › Local AI (CustomComponent/LocalAi) shows whether
the language-model classifier is on and which model it asks. It's off
until someone turns it on. Setting it up asks "Guided or manual?": guided
explains what's sent (subject and text only), that the model's word is one
bounded signal and never holds up mail, and recommends running Qwen3 4B
Instruct 2507 locally under llama.cpp or Ollama; it then takes the model's
address and the prompt, creates the model (or reuses one of the same name)
and switches the classifier on with its real id. Manual goes to the
ordinary forms. Turning it off is one click and keeps the model. The page
also edits inbuxa:AiLimits, sending a return to a default as null so the
server keeps following it.

On the schema-driven forms (ai-spam-classification spec, "INBUXA Admin"):
the default prompt is prefilled when the classifier is switched to
Enabled, the model form suggests local addresses, a model outside the
network gets the AI-2 warning (advisory, never blocking), and the
classifier form says failures never hold up mail.

The server's schema gains the menu link separately, after this release.

src/lib/layout.ts

@@ -71,6 +71,11 @@ function checkSpecialLink(
     return { visible: canGet ? canGet('sysNetworkListener') : true, enterprise: false };
   }
 
+  // inbuxa: the Local AI page is for whoever may see the AI classifier.
+  if (viewName === 'CustomComponent/LocalAi') {
+    return { visible: canGet ? canGet('sysSpamLlm') : true, enterprise: false };
+  }
+
   if (viewName.startsWith('CustomComponent/')) {
     return { visible: true, enterprise: false };
   }