feat(image): 新建 knowai-core:1.0.0 镜像并完成推送

- 搭建 api、auth、utils 等逻辑模块
- 通过 tsc、eslint、vitest 测试验证

BREAKING CHANGE: 新镜像分支

utils/date.ts

@@ -0,0 +1,83 @@
+// 日期格式化工具
+export const dateUtils = {
+  // 格式化日期
+  formatDate: (date: Date | string, format = 'YYYY-MM-DD'): string => {
+    const d = new Date(date);
+
+    if (isNaN(d.getTime())) {
+      return '';
+    }
+
+    const year = d.getFullYear();
+    const month = String(d.getMonth() + 1).padStart(2, '0');
+    const day = String(d.getDate()).padStart(2, '0');
+    const hours = String(d.getHours()).padStart(2, '0');
+    const minutes = String(d.getMinutes()).padStart(2, '0');
+    const seconds = String(d.getSeconds()).padStart(2, '0');
+
+    return format
+      .replace('YYYY', String(year))
+      .replace('MM', month)
+      .replace('DD', day)
+      .replace('HH', hours)
+      .replace('mm', minutes)
+      .replace('ss', seconds);
+  },
+
+  // 获取相对时间（如：2小时前）
+  getRelativeTime: (date: Date | string): string => {
+    const now = new Date();
+    const target = new Date(date);
+    const diffMs = now.getTime() - target.getTime();
+
+    // 如果目标时间在未来，返回绝对时间
+    if (diffMs < 0) {
+      return dateUtils.formatDate(target, 'YYYY-MM-DD HH:mm');
+    }
+
+    const diffSeconds = Math.floor(diffMs / 1000);
+    const diffMinutes = Math.floor(diffSeconds / 60);
+    const diffHours = Math.floor(diffMinutes / 60);
+    const diffDays = Math.floor(diffHours / 24);
+    const diffWeeks = Math.floor(diffDays / 7);
+    const diffMonths = Math.floor(diffDays / 30);
+    const diffYears = Math.floor(diffDays / 365);
+
+    if (diffSeconds < 60) {
+      return '刚刚';
+    } else if (diffMinutes < 60) {
+      return `${diffMinutes}分钟前`;
+    } else if (diffHours < 24) {
+      return `${diffHours}小时前`;
+    } else if (diffDays < 7) {
+      return `${diffDays}天前`;
+    } else if (diffWeeks < 4) {
+      return `${diffWeeks}周前`;
+    } else if (diffMonths < 12) {
+      return `${diffMonths}个月前`;
+    } else {
+      return `${diffYears}年前`;
+    }
+  },
+
+  // 检查是否是今天
+  isToday: (date: Date | string): boolean => {
+    const today = new Date();
+    const target = new Date(date);
+
+    return today.getFullYear() === target.getFullYear() &&
+           today.getMonth() === target.getMonth() &&
+           today.getDate() === target.getDate();
+  },
+
+  // 检查是否是昨天
+  isYesterday: (date: Date | string): boolean => {
+    const yesterday = new Date();
+    yesterday.setDate(yesterday.getDate() - 1);
+    const target = new Date(date);
+
+    return yesterday.getFullYear() === target.getFullYear() &&
+           yesterday.getMonth() === target.getMonth() &&
+           yesterday.getDate() === target.getDate();
+  }
+};