大图查看页面增加日历展示，支持显示节假日信息，提高实用性

webapp/src/types/lunar-javascript.d.ts

@@ -0,0 +1,20 @@
+declare module 'lunar-javascript' {
+  export class Solar {
+    static fromDate(date: Date): Solar
+    getLunar(): Lunar
+    getFestivals(): string[]
+  }
+
+  export class Lunar {
+    getYearInChinese(): string
+    getMonthInChinese(): string
+    getDayInChinese(): string
+    getDay(): number
+    getJieQi(): string
+    getFestivals(): string[]
+  }
+
+  export class HolidayUtil {
+    // Add methods if needed
+  }
+}