fix: show custom vision models in LLM selector and model list

Expose user-added imageToText custom models as vision-capable chat
models in the default LLM selector and /v1/models, map custom service
kinds to runtime capabilities, and keep typed filtering for
/v1/models/{kind}.

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

open-sse/providers/capabilities.js

@@ -51,6 +51,21 @@ export const DEFAULT_CAPABILITIES = {
   maxOutput: 64000,
 };
 
+// User-added model metadata can carry dashboard service kinds instead of the
+// runtime capability names used here. Map those typed model kinds into input /
+// output capabilities so custom vision models are not treated as text-only.
+const SERVICE_KIND_CAPABILITIES = {
+  imageToText: { vision: true },
+  image: { imageOutput: true },
+  stt: { audioInput: true },
+  tts: { audioOutput: true },
+  embedding: { tools: false },
+};
+
+export function capabilitiesFromServiceKind(kind) {
+  return SERVICE_KIND_CAPABILITIES[kind] || null;
+}
+
 /**
  * Canonical exact-id overrides — used for exceptions that patterns would
  * otherwise mis-match. Only declare deltas vs DEFAULT.