pass default system prompt into UI

Author: mitya52

refact-agent/engine/src/caps.rs

@@ -148,8 +148,8 @@ pub struct CodeAssistantCaps {
     pub running_models: Vec<String>,  // check there if a model is available or not, not in other places
     #[serde(default)]
     pub caps_version: i64,  // need to reload if it increases on server, that happens when server configuration changes
-    // #[serde(default)]
-    // pub code_chat_default_system_prompt: String,
+    #[serde(default)]
+    pub code_chat_default_system_prompt: String,
 
     #[serde(default)]
     pub customization: String,  // on self-hosting server, allows to customize yaml_configs & friends for all engineers

refact-agent/gui/src/components/ChatForm/PromptSelect.tsx

@@ -6,6 +6,7 @@ import {
   useAppDispatch,
   useAppSelector,
   useGetPromptsQuery,
+  useGetCapsQuery,
 } from "../../hooks";
 import { getSelectedSystemPrompt } from "../../features/Chat/Thread/selectors";
 import { setSystemPrompt } from "../../features/Chat/Thread/actions";
@@ -30,8 +31,10 @@ export const PromptSelect: React.FC = () => {
     [onSetSelectedSystemPrompt, promptsRequest.data],
   );
 
+  const caps = useGetCapsQuery();
+  const default_system_prompt = caps.data?.code_chat_default_system_prompt ?? "default";
   const val = useMemo(
-    () => Object.keys(selectedSystemPrompt)[0] ?? "default",
+    () => Object.keys(selectedSystemPrompt)[0] ?? default_system_prompt,
     [selectedSystemPrompt],
   );