diff --git a/internal/database/seed_app.go b/internal/database/seed_app.go
new file mode 100644
index 0000000..7734166
--- /dev/null
+++ b/internal/database/seed_app.go
@@ -0,0 +1,75 @@
+package database
+
+import (
+	"log"
+
+	"gotest/internal/model"
+
+	"gorm.io/gorm"
+)
+
+// seedAppData 初始化应用数据（3 套应用网站共用）
+func seedAppData(db *gorm.DB) error {
+	var count int64
+	db.Model(&model.App{}).Count(&count)
+	if count > 0 {
+		log.Println("检测到已有应用数据，跳过初始化")
+		return nil
+	}
+
+	// 应用分类
+	categories := []model.AppCategory{
+		{Name: "社交通讯", Icon: "social", Sort: 1},
+		{Name: "效率办公", Icon: "productivity", Sort: 2},
+		{Name: "影音娱乐", Icon: "entertainment", Sort: 3},
+		{Name: "生活服务", Icon: "lifestyle", Sort: 4},
+		{Name: "教育学习", Icon: "education", Sort: 5},
+		{Name: "工具开发", Icon: "tools", Sort: 6},
+	}
+	for i := range categories {
+		if err := db.Create(&categories[i]).Error; err != nil {
+			return err
+		}
+	}
+
+	// 应用数据
+	apps := []model.App{
+		// 社交通讯
+		{Name: "云信 Messenger", Description: "跨平台即时通讯应用，支持文字、语音、视频通话，端到端加密保障隐私安全。群聊最多支持 500 人，文件传输不限大小，消息多端同步永久保存。", CategoryID: 1, CategoryName: "社交通讯", Developer: "CloudCom Inc.", Rating: 4.8, Reviews: 1280000, Downloads: 56000000, Size: "85 MB", Version: "v8.2.1", UpdateDate: "2026-06-20", Platform: "iOS / Android / PC / Mac", Price: "免费", Tags: `["即时通讯","加密","视频通话"]`, Features: `["端到端加密","500人群聊","多端同步","文件传输"]`, IsFeatured: true, Sort: 1, Status: 1},
+		{Name: "脉圈社交", Description: "兴趣社交平台，找到志同道合的朋友。基于 AI 推荐算法匹配兴趣圈子，支持语音房、直播、动态分享。让社交更有温度。", CategoryID: 1, CategoryName: "社交通讯", Developer: "Circle Tech", Rating: 4.5, Reviews: 680000, Downloads: 23000000, Size: "120 MB", Version: "v5.6.0", UpdateDate: "2026-07-01", Platform: "iOS / Android", Price: "免费", Tags: `["兴趣社交","语音房","直播"]`, Features: `["AI兴趣匹配","语音聊天室","直播互动","动态广场"]`, IsNew: true, Sort: 2, Status: 1},
+		{Name: "邮管家 Pro", Description: "专业邮件管理工具，聚合管理多个邮箱账号。智能分类、日程提取、AI 草稿撰写，让邮件处理效率提升 300%。", CategoryID: 1, CategoryName: "社交通讯", Developer: "MailPro Studio", Rating: 4.6, Reviews: 320000, Downloads: 8500000, Size: "45 MB", Version: "v3.4.2", UpdateDate: "2026-05-15", Platform: "iOS / Android / PC / Mac", Price: "免费", Tags: `["邮件管理","AI助手","效率"]`, Features: `["多邮箱聚合","AI智能分类","日程自动提取","草稿AI撰写"]`, Sort: 3, Status: 1},
+
+		// 效率办公
+		{Name: "Notion 笔记 Pro", Description: "一体化工作空间，集笔记、文档、数据库、看板、日历于一体。团队协作实时同步，支持 50+ 内容块类型，API 开放生态。", CategoryID: 2, CategoryName: "效率办公", Developer: "Notion Labs", Rating: 4.9, Reviews: 2100000, Downloads: 45000000, Size: "65 MB", Version: "v10.0.0", UpdateDate: "2026-06-28", Platform: "全平台", Price: "免费", Tags: `["笔记","协作","数据库"]`, Features: `["50+内容块","实时协作","数据库视图","API开放"]`, IsFeatured: true, Sort: 1, Status: 1},
+		{Name: "飞项项目管理", Description: "敏捷项目管理工具，支持 Scrum/Kanban 双模式。甘特图、燃尽图、工时统计、自动报表，让团队交付更高效。", CategoryID: 2, CategoryName: "效率办公", Developer: "FeiXiang Team", Rating: 4.7, Reviews: 890000, Downloads: 15000000, Size: "78 MB", Version: "v6.1.0", UpdateDate: "2026-07-05", Platform: "iOS / Android / PC / Mac", Price: "免费", Tags: `["项目管理","敏捷","协作"]`, Features: `["Scrum/Kanban","甘特图","工时统计","自动报表"]`, IsNew: true, Sort: 2, Status: 1},
+		{Name: "极简扫描仪", Description: "手机扫描仪，拍照即文档。AI 自动裁切矫正、OCR 文字识别支持 50+ 语言、PDF/JPEG 导出、电子签名，随身办公利器。", CategoryID: 2, CategoryName: "效率办公", Developer: "ScanPro", Rating: 4.6, Reviews: 560000, Downloads: 12000000, Size: "38 MB", Version: "v4.2.0", UpdateDate: "2026-04-20", Platform: "iOS / Android", Price: "免费", Tags: `["扫描","OCR","PDF"]`, Features: `["AI自动裁切","50+语言OCR","电子签名","云端同步"]`, Sort: 3, Status: 1},
+
+		// 影音娱乐
+		{Name: "云音 Music", Description: "高品质音乐流媒体，支持无损/Hi-Res 音质。AI 个性化推荐、歌词翻译、音乐社区、播客内容，5000 万+ 曲库等你探索。", CategoryID: 3, CategoryName: "影音娱乐", Developer: "CloudMusic", Rating: 4.8, Reviews: 3200000, Downloads: 89000000, Size: "95 MB", Version: "v9.0.0", UpdateDate: "2026-06-15", Platform: "全平台", Price: "免费", Tags: `["音乐","无损","推荐"]`, Features: `["无损/Hi-Res音质","AI个性化推荐","5000万曲库","播客内容"]`, IsFeatured: true, IsNew: true, Sort: 1, Status: 1},
+		{Name: "极影视频", Description: "短视频+长视频融合平台。4K 超清播放、智能跳片、弹幕互动、创作者激励计划。海量优质内容每日更新。", CategoryID: 3, CategoryName: "影音娱乐", Developer: "JiYing Media", Rating: 4.5, Reviews: 1800000, Downloads: 67000000, Size: "110 MB", Version: "v7.3.0", UpdateDate: "2026-07-02", Platform: "iOS / Android / PC", Price: "免费", Tags: `["视频","4K","弹幕"]`, Features: `["4K超清播放","智能跳片","弹幕互动","创作者激励"]`, Sort: 2, Status: 1},
+		{Name: "播客空间", Description: "优质播客聚合平台，百万节目免费收听。睡眠定时、倍速播放、智能下载、离线收听，通勤路上的最佳伴侣。", CategoryID: 3, CategoryName: "影音娱乐", Developer: "Podcast Space", Rating: 4.7, Reviews: 420000, Downloads: 9800000, Size: "52 MB", Version: "v3.0.5", UpdateDate: "2026-05-30", Platform: "iOS / Android", Price: "免费", Tags: `["播客","音频","离线"]`, Features: `["百万播客节目","睡眠定时","智能下载","离线收听"]`, Sort: 3, Status: 1},
+
+		// 生活服务
+		{Name: "美团生活+", Description: "一站式生活服务平台，外卖、到店、酒店、机票、电影票、打车、买菜。覆盖 2800+ 城市，每天千万优惠等你享。", CategoryID: 4, CategoryName: "生活服务", Developer: "Meituan", Rating: 4.6, Reviews: 5600000, Downloads: 120000000, Size: "180 MB", Version: "v12.5.0", UpdateDate: "2026-07-08", Platform: "iOS / Android", Price: "免费", Tags: `["外卖","生活服务","优惠"]`, Features: `["2800+城市覆盖","外卖到店","酒店机票","每日千万优惠"]`, IsFeatured: true, Sort: 1, Status: 1},
+		{Name: "健康助手", Description: "AI 健康管理应用，记录运动、睡眠、饮食、心率。AI 健康报告、个性化运动计划、用药提醒、在线问诊，你的私人健康管家。", CategoryID: 4, CategoryName: "生活服务", Developer: "HealthPlus", Rating: 4.5, Reviews: 780000, Downloads: 18000000, Size: "88 MB", Version: "v5.0.0", UpdateDate: "2026-06-10", Platform: "iOS / Android", Price: "免费", Tags: `["健康","运动","AI"]`, Features: `["AI健康报告","个性化运动计划","用药提醒","在线问诊"]`, Sort: 2, Status: 1},
+		{Name: "旅行蜂巢", Description: "智能旅行规划助手，AI 一键生成行程攻略。景点门票、酒店预订、当地美食、实时翻译、离线地图，旅行如此简单。", CategoryID: 4, CategoryName: "生活服务", Developer: "TravelHive", Rating: 4.7, Reviews: 950000, Downloads: 25000000, Size: "130 MB", Version: "v4.8.0", UpdateDate: "2026-07-03", Platform: "iOS / Android", Price: "免费", Tags: `["旅行","AI规划","翻译"]`, Features: `["AI行程规划","景点门票预订","实时翻译","离线地图"]`, IsNew: true, Sort: 3, Status: 1},
+
+		// 教育学习
+		{Name: "多邻国语言", Description: "游戏化学语言应用，覆盖 40+ 语言。闯关式学习、AI 口语练习、个性化复习曲线，每天 15 分钟轻松掌握一门新语言。", CategoryID: 5, CategoryName: "教育学习", Developer: "Duolingo Inc.", Rating: 4.8, Reviews: 2800000, Downloads: 78000000, Size: "70 MB", Version: "v6.5.0", UpdateDate: "2026-06-25", Platform: "iOS / Android / PC", Price: "免费", Tags: `["语言学习","游戏化","口语"]`, Features: `["40+语言","闯关式学习","AI口语练习","个性化复习"]`, IsFeatured: true, Sort: 1, Status: 1},
+		{Name: "知识星球", Description: "优质知识社区平台，加入你感兴趣的领域圈子。行业大咖分享、深度专栏、付费课程、问答互动，持续学习持续成长。", CategoryID: 5, CategoryName: "教育学习", Developer: "Knowledge Planet", Rating: 4.6, Reviews: 650000, Downloads: 14000000, Size: "58 MB", Version: "v5.2.0", UpdateDate: "2026-05-18", Platform: "iOS / Android / PC", Price: "免费", Tags: `["知识社区","课程","问答"]`, Features: `["行业圈子","深度专栏","付费课程","问答互动"]`, Sort: 2, Status: 1},
+		{Name: "数学大师", Description: "AI 数学解题助手，拍照即解。覆盖小学到大学全阶段数学，详细步骤解析、知识点关联、同类题推荐，学霸养成神器。", CategoryID: 5, CategoryName: "教育学习", Developer: "MathMaster", Rating: 4.5, Reviews: 890000, Downloads: 22000000, Size: "62 MB", Version: "v3.8.0", UpdateDate: "2026-06-12", Platform: "iOS / Android", Price: "免费", Tags: `["数学","AI解题","教育"]`, Features: `["拍照解题","详细步骤解析","知识点关联","同类题推荐"]`, IsNew: true, Sort: 3, Status: 1},
+
+		// 工具开发
+		{Name: "DevBox 代码编辑器", Description: "移动端专业代码编辑器，支持 80+ 编程语言语法高亮。Git 集成、SSH 终端、AI 代码补全、正则测试，随时随地进行代码工作。", CategoryID: 6, CategoryName: "工具开发", Developer: "DevBox Studio", Rating: 4.7, Reviews: 560000, Downloads: 6500000, Size: "92 MB", Version: "v4.0.0", UpdateDate: "2026-07-06", Platform: "iOS / Android / PC", Price: "免费", Tags: `["代码编辑","Git","SSH"]`, Features: `["80+语言高亮","Git集成","SSH终端","AI代码补全"]`, IsFeatured: true, Sort: 1, Status: 1},
+		{Name: "API 测试大师", Description: "专业 API 调试工具，支持 REST/GraphQL/WebSocket。环境变量管理、批量测试、性能压测、自动化测试脚本，前后端联调利器。", CategoryID: 6, CategoryName: "工具开发", Developer: "APIMaster", Rating: 4.6, Reviews: 340000, Downloads: 4200000, Size: "48 MB", Version: "v2.5.0", UpdateDate: "2026-06-08", Platform: "iOS / Android / PC / Mac", Price: "免费", Tags: `["API","调试","测试"]`, Features: `["REST/GraphQL/WebSocket","环境变量管理","性能压测","自动化脚本"]`, Sort: 2, Status: 1},
+		{Name: "文件管家 X", Description: "全能文件管理工具，支持 100+ 格式预览。ZIP/RAR/7Z 解压、PDF 合并分割、图片批量处理、云盘聚合，手机文件管理终极方案。", CategoryID: 6, CategoryName: "工具开发", Developer: "FileManagerX", Rating: 4.5, Reviews: 720000, Downloads: 15000000, Size: "55 MB", Version: "v6.0.0", UpdateDate: "2026-05-25", Platform: "iOS / Android", Price: "免费", Tags: `["文件管理","解压","PDF"]`, Features: `["100+格式预览","多格式解压","PDF处理","云盘聚合"]`, Sort: 3, Status: 1},
+	}
+	for i := range apps {
+		if err := db.Create(&apps[i]).Error; err != nil {
+			return err
+		}
+	}
+
+	log.Printf("应用数据初始化完成（%d 分类 + %d 应用）", len(categories), len(apps))
+	return nil
+}