docs(website): 添加简记memo产品原型和UI设计规范文档

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- 新增简记memo完整版UI视觉设计规范和界面细节
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- 创建404页面HTML文件，包含响应式布局和错误提示
- 添加关于页面HTML文件，展示品牌介绍和团队信息
- 实现AES加解密工具函数，支持请求体加密
- 添加用户协议页面基础框架

core/cron.go

@@ -0,0 +1,58 @@
+package core
+
+import (
+	"time"
+
+	"simple-memo/global"
+	"simple-memo/models"
+
+	"go.uber.org/zap"
+)
+
+func InitCron() {
+	go func() {
+		for {
+			now := time.Now()
+			next := getNextRunTime(10, 0)
+			duration := next.Sub(now)
+
+			time.Sleep(duration)
+
+			checkPerfectDay()
+		}
+	}()
+}
+
+func getNextRunTime(hour, minute int) time.Time {
+	now := time.Now()
+	today := time.Date(now.Year(), now.Month(), now.Day(), hour, minute, 0, 0, now.Location())
+
+	if now.Before(today) {
+		return today
+	}
+	return today.AddDate(0, 0, 1)
+}
+
+func checkPerfectDay() {
+	yesterday := time.Now().AddDate(0, 0, -1).Format("2006-01-02")
+
+	var progressList []models.DailyProgress
+	err := global.DB.Where("record_date = ?", yesterday).Find(&progressList).Error
+	if err != nil {
+		global.Logger.Error("查询每日进度失败", zap.Error(err))
+		return
+	}
+
+	for _, progress := range progressList {
+		if progress.TotalTasks > 0 && progress.TaskCount >= progress.TotalTasks && !progress.PerfectDay {
+			err := global.DB.Model(&models.DailyProgress{}).
+				Where("id = ?", progress.ID).
+				Update("perfect_day", true).Error
+			if err != nil {
+				global.Logger.Error("更新PerfectDay失败", zap.Error(err))
+			}
+		}
+	}
+
+	global.Logger.Info("PerfectDay check completed", zap.String("date", yesterday))
+}