feat: 添加测试用户到种子数据, AI改写功能优化, 前端联调修复

server/sql/seed_stories_part1.sql

@@ -1,7 +1,15 @@
--- 10个种子故事数据
+-- 种子数据：测试用户 + 10个故事
 USE stardom_story;
 
+-- ============================================
+-- 测试用户
+-- ============================================
+INSERT INTO `users` (`id`, `openid`, `nickname`, `avatar_url`, `gender`, `total_play_count`, `total_endings`) VALUES
+(1, 'test_user', '测试用户', '', 0, 0, 0);
+
+-- ============================================
 -- 1. 都市言情：《总裁的替身新娘》
+-- ============================================
 INSERT INTO stories (id, title, cover_url, description, category, play_count, like_count, is_featured) VALUES
 (1, '总裁的替身新娘', '', '一场阴差阳错的婚礼，让平凡的你成为了霸道总裁的替身新娘。他冷漠、神秘，却在深夜对你展现出不一样的温柔...', '都市言情', 15680, 3420, TRUE);