fix(小程序): 修复 createFamily API 路径错误

将 /api/user/create-family 更正为 /api/family/user/create-family
与后端 FamilyUserController 路径匹配

cfc-frontend/utils/api.js

@@ -169,7 +169,7 @@ export const joinFamily = (inviteCode) => {
 }
 
 export const createFamily = (name) => {
-	return request('/api/user/create-family', 'POST', { name })
+	return request('/api/family/user/create-family', 'POST', { name })
 }
 
 // 获取家庭所有成员（家长+孩子）