Fix model name parsing

Author: Jakub Zika

src/eca/llm_api.clj

@@ -172,7 +172,7 @@
        callbacks)
 
       (contains? custom-models model)
-      (let [[provider model] (string/split model #"/")
+      (let [[provider model] (string/split model #"/" 2)
             provider-config (get custom-providers (keyword provider))
             provider-fn (case (:api provider-config)
                           "openai" llm-providers.openai/completion!