feat(home,my): 首页和我的页从缓存回显用户信息

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

miniprogram/utils/idCard/index.ts

@@ -38,3 +38,17 @@ export const parseIdCard = (idCard: string): IdCardParsed => {
         sex,
     }
 }
+
+/** 从生日字符串（YYYY-MM-DD）计算周岁 */
+export const calcAge = (birthday: string): number => {
+    if (!birthday) return 0
+    const parts = birthday.split('-').map(Number)
+    const [year, month, day] = parts
+    if (!year || !month || !day) return 0
+    const now = new Date()
+    let age = now.getFullYear() - year
+    const nowMonth = now.getMonth() + 1
+    const nowDay = now.getDate()
+    if (nowMonth < month || (nowMonth === month && nowDay < day)) age -= 1
+    return Math.max(0, age)
+}