feat: embedding model warning modal on frontend load

- InfoEndpoint: EmbeddingService injiziert, embeddingAvailable in /api/info Response
- title.js: _showEmbeddingWarning() Modal via _createModal() wenn Modell fehlt
- base.css: ol margin-left wie ul (geordnete Listen)

Endpoints/InfoEndpoint.cs

@@ -1,6 +1,7 @@
 using System;
 using System.IO;
 using System.Reflection;
+using Gott.Services;
 using Microsoft.AspNetCore.Builder;
 using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Routing;
@@ -14,7 +15,7 @@ public static class InfoEndpoint
         app.MapGet("/api/info", HandleInfo);
     }
 
-    private static IResult HandleInfo()
+    private static IResult HandleInfo(EmbeddingService embeddingService)
     {
         var assembly = Assembly.GetExecutingAssembly();
         var location = assembly.Location;
@@ -39,6 +40,7 @@ public static class InfoEndpoint
         }
 
         var isWindows = System.Runtime.InteropServices.RuntimeInformation.IsOSPlatform(System.Runtime.InteropServices.OSPlatform.Windows);
-        return Results.Json(new { buildTime, isWindows });
+        var embeddingAvailable = embeddingService.IsAvailable;
+        return Results.Json(new { buildTime, isWindows, embeddingAvailable });
     }
 }

wwwroot/css/base.css

@@ -126,6 +126,6 @@ a:hover {
   text-decoration: underline;
 }
 
-ul {
+ul, ol {
   margin-left: 1.5em;
 }

wwwroot/js/title.js

@@ -6,8 +6,24 @@ fetch('/api/info').then(r => r.json()).then(data => {
   serverIsWindows = !!data.isWindows;
   updateTitle();
   setInterval(updateTitle, 1000);
+  if (data.embeddingAvailable === false) _showEmbeddingWarning();
 });
 
+function _showEmbeddingWarning() {
+  const { body } = _createModal('⚠️ Embedding-Modell nicht gefunden');
+  body.style.lineHeight = '1.7';
+  body.innerHTML =
+    '<p>Das Embedding-Modell <strong>all-MiniLM-L6-v2</strong> wurde nicht gefunden. ' +
+    'Ohne dieses Modell ist die semantische Suche (<code>memory_search</code>) deaktiviert.</p>' +
+    '<h3>So richtest du es ein:</h3>' +
+    '<ol>' +
+      '<li>Lade das Modell herunter: <a href="https://huggingface.co/sentence-transformers/all-MiniLM-L6-v2" target="_blank">HuggingFace – all-MiniLM-L6-v2</a></li>' +
+      '<li>Benötigte Dateien: <code>model.onnx</code> und <code>vocab.txt</code></li>' +
+      '<li>Lege sie ab unter:<br><code>data/models/all-MiniLM-L6-v2/model.onnx</code><br><code>data/models/all-MiniLM-L6-v2/vocab.txt</code></li>' +
+      '<li>Starte den Server neu</li>' +
+    '</ol>';
+}
+
 function updateTitle() {
   if (!buildTime) { document.title = '// gott'; return; }
   const s = Math.floor(Date.now() / 1000) - buildTime;