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 });
     }
 }