test(client): update model and enable live SendMessage test

backend/internal/client/client_test.go

@@ -12,11 +12,9 @@ import (
 	"reichard.io/aethera/internal/store"
 )
 
-const model = "qwen3-8b-vision"
+const model = "qwen3.5-9b-thinking"
 
 func TestSendMessage(t *testing.T) {
-	t.Skip("requires live LLM API - run manually with: go test -run TestSendMessage ./internal/client/")
-
 	// Initialize Client
 	baseURL, err := url.Parse("https://llm-api.va.reichard.io/v1")
 	if err != nil {