feat: 小趣手表APP Android原生重构 - 基础框架搭建

已完成的模块：
1. 项目脚手架 - Gradle配置、28个包目录、核心基类
2. 权限管理 - 确认定制ROM已预授权所有权限
3. 工具类 - DateUtil/DeviceUtil/NetworkUtil/Md5Util
4. 设备信息 - DevicePrefs/UserPrefs (SharedPreferences)
5. 网络层 - OkHttp+Retrofit+MD5签名拦截器+解绑拦截器
6. 基础UI组件 - NavBarView/QuTipDialog/QuConfirmDialog/ActionButton/iconfont

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app/src/main/java/com/xiaoqu/watch/util/DateUtil.kt

@@ -0,0 +1,78 @@
+package com.xiaoqu.watch.util
+
+import java.text.SimpleDateFormat
+import java.util.Calendar
+import java.util.Date
+import java.util.Locale
+
+/**
+ * 日期格式化工具
+ * 对应旧版 commonUtil.js 的 getDateTime()
+ */
+object DateUtil {
+
+    private val weekNames = arrayOf("周日", "周一", "周二", "周三", "周四", "周五", "周六")
+
+    private val formatDateTime = SimpleDateFormat("yyyy-MM-dd HH:mm:ss", Locale.CHINA)
+    private val formatDate = SimpleDateFormat("MM月dd日", Locale.CHINA)
+    private val formatTime = SimpleDateFormat("HH:mm:ss", Locale.CHINA)
+    private val formatTimeShort = SimpleDateFormat("HH:mm", Locale.CHINA)
+
+    /** 完整日期时间：2026-04-24 20:15:30 */
+    fun formatDateTime(timestamp: Long = System.currentTimeMillis()): String {
+        return formatDateTime.format(Date(timestamp))
+    }
+
+    /** 月日：04月24日 */
+    fun formatDate(timestamp: Long = System.currentTimeMillis()): String {
+        return formatDate.format(Date(timestamp))
+    }
+
+    /** 时分秒：20:15:30 */
+    fun formatTime(timestamp: Long = System.currentTimeMillis()): String {
+        return formatTime.format(Date(timestamp))
+    }
+
+    /** 时分：20:15 */
+    fun formatTimeShort(timestamp: Long = System.currentTimeMillis()): String {
+        return formatTimeShort.format(Date(timestamp))
+    }
+
+    /** 星期：周四 */
+    fun getWeekDay(timestamp: Long = System.currentTimeMillis()): String {
+        val calendar = Calendar.getInstance()
+        calendar.timeInMillis = timestamp
+        return weekNames[calendar.get(Calendar.DAY_OF_WEEK) - 1]
+    }
+
+    /**
+     * 获取完整日期信息（对应旧版 getDateTime() 返回对象）
+     */
+    fun getDateInfo(timestamp: Long = System.currentTimeMillis()): DateInfo {
+        val calendar = Calendar.getInstance()
+        calendar.timeInMillis = timestamp
+        return DateInfo(
+            date = formatDate(timestamp),
+            time = formatTime(timestamp),
+            week = weekNames[calendar.get(Calendar.DAY_OF_WEEK) - 1],
+            year = calendar.get(Calendar.YEAR),
+            month = calendar.get(Calendar.MONTH) + 1,
+            day = calendar.get(Calendar.DAY_OF_MONTH),
+            hour = calendar.get(Calendar.HOUR_OF_DAY),
+            minute = calendar.get(Calendar.MINUTE),
+            second = calendar.get(Calendar.SECOND)
+        )
+    }
+
+    data class DateInfo(
+        val date: String,
+        val time: String,
+        val week: String,
+        val year: Int,
+        val month: Int,
+        val day: Int,
+        val hour: Int,
+        val minute: Int,
+        val second: Int
+    )
+}