fix: add missing hooks and fix type error

src/lib/useSystemPrompts.ts

@@ -0,0 +1,71 @@
+import { useState, useEffect, useCallback } from "react";
+
+export type SystemPrompts = {
+  all: string;
+  partial: string;
+  style_normal: string;
+  style_crazy: string;
+  lyrics_partial: string;
+};
+
+export function useSystemPrompts() {
+  const [prompts, setPrompts] = useState<SystemPrompts | null>(null);
+  const [loading, setLoading] = useState(true);
+  const [error, setError] = useState<string | null>(null);
+
+  const fetchPrompts = useCallback(async () => {
+    try {
+      setLoading(true);
+      const res = await fetch("/api/system-prompts");
+      if (!res.ok) throw new Error("Failed to fetch system prompts");
+      const data = await res.json();
+      setPrompts(data);
+      setError(null);
+    } catch (err) {
+      setError(err instanceof Error ? err.message : "Unknown error");
+    } finally {
+      setLoading(false);
+    }
+  }, []);
+
+  const savePrompts = async (newPrompts: SystemPrompts) => {
+    try {
+      setLoading(true);
+      const res = await fetch("/api/system-prompts", {
+        method: "POST",
+        headers: { "Content-Type": "application/json" },
+        body: JSON.stringify(newPrompts),
+      });
+      if (!res.ok) throw new Error("Failed to save system prompts");
+      setPrompts(newPrompts);
+      setError(null);
+      return true;
+    } catch (err) {
+      setError(err instanceof Error ? err.message : "Unknown error");
+      return false;
+    } finally {
+      setLoading(false);
+    }
+  };
+
+  const resetPrompts = async () => {
+    try {
+      setLoading(true);
+      const res = await fetch("/api/system-prompts", { method: "DELETE" });
+      if (!res.ok) throw new Error("Failed to reset system prompts");
+      await fetchPrompts();
+      return true;
+    } catch (err) {
+      setError(err instanceof Error ? err.message : "Unknown error");
+      return false;
+    } finally {
+      setLoading(false);
+    }
+  };
+
+  useEffect(() => {
+    fetchPrompts();
+  }, [fetchPrompts]);
+
+  return { prompts, loading, error, savePrompts, resetPrompts };
+}