Stack portrait LoRAs and embeddings from model, preset, and shot kind.

Swarm loads LoRAs via loras/loraweights; embeddings go in the prompt as embed tags, not lora tags.

Co-authored-by: Cursor <cursoragent@cursor.com>

tests/HSchool.Server.Tests/SwarmUiLoraFormatterTests.cs

@@ -63,6 +63,7 @@ public class SwarmUiLoraFormatterTests
 
         Assert.Equal(["pos.safetensors", "neg.safetensors"], discovery.Embeddings);
         Assert.Equal(["style.safetensors"], discovery.Loras);
+        Assert.Empty(SwarmUiDiscovery.Offline.Embeddings);
     }
 
     [Fact]