fix: 修复偏好设置 API 路径 + ChartDisplay 空值处理

- PreferencesSettings: 修正 API 路径 /api/v1/config/config → /api/v1/config
- ChartDisplay: 添加 data[0] 空值检查，防止 Object.keys 崩溃

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: MKY508

apps/web/src/components/chat/ChartDisplay.tsx

@@ -47,9 +47,12 @@ export function ChartDisplay({
 }: ChartDisplayProps) {
   // 自动检测数据键
   const keys = useMemo(() => {
-    if (!data || data.length === 0) return { x: xKey, y: yKey };
+    if (!data || data.length === 0) return { x: xKey, y: yKey, allNumberKeys: [] };
 
     const firstItem = data[0];
+    if (!firstItem || typeof firstItem !== "object") {
+      return { x: xKey, y: yKey, allNumberKeys: [] };
+    }
     const allKeys = Object.keys(firstItem);
 
     // 尝试找到合适的 x 和 y 键

apps/web/src/components/settings/PreferencesSettings.tsx

@@ -27,15 +27,15 @@ export function PreferencesSettings() {
   const { data: config, isLoading } = useQuery({
     queryKey: ["user-config"],
     queryFn: async () => {
-      const response = await api.get("/api/v1/config/config");
+      const response = await api.get("/api/v1/config");
       return response.data.data as UserConfig;
     },
   });
 
   // 更新配置
   const updateMutation = useMutation({
     mutationFn: async (data: UserConfig) => {
-      const response = await api.put("/api/v1/config/config", data);
+      const response = await api.put("/api/v1/config", data);
       return response.data;
     },
     onSuccess: () => {