feat: add system prompt command

Author: tmg0

app/stores/assistant.ts

@@ -0,0 +1,7 @@
+export const useAssistantStore = defineStore('assistant', () => {
+  const system = ref('')
+
+  return {
+    system,
+  }
+})

app/utils/assistant.ts

@@ -0,0 +1,14 @@
+interface DefineSystemPromptOptions {
+  system: MaybeRef<string> | (() => Promise<MaybeRef<string>>)
+}
+
+export function defineAssistantContext(options: DefineSystemPromptOptions) {
+  const store = storeToRefs(useAssistantStore())
+  const system = typeof options.system === 'function' ? options.system() : Promise.resolve(options.system)
+
+  async function setup() {
+    store.system.value = unref(await system)
+  }
+
+  setup()
+}