Feat 为画廊模式添加每页显示图片数量的配置 (#82)

* Feat: Add dynamic image-per-page configuration for gallery mode

- Implemented a slider to configure the number of images displayed per page (1-5) in gallery mode.
- Updated the reader to dynamically reflect changes in the `imagesPerPage` setting without requiring a mode switch or reopening.
- Ensured compatibility with existing continuous reading mode.

* fix currentImagesPerPage

* fix Continuous mode

* improve readerScreenPicNumber setting disable view

* improve PhotoViewController

assets/translation.json

@@ -105,6 +105,7 @@
     "Continuous (Right to Left)": "连续（从右到左）",
     "Continuous (Top to Bottom)": "连续（从上到下）",
     "Auto page turning interval": "自动翻页间隔",
+    "The number of pic in screen (Only Gallery Mode)": "同屏幕图片数量(仅画廊模式)",
     "Theme Mode": "主题模式",
     "System": "系统",
     "Light": "浅色",
@@ -353,6 +354,7 @@
     "Continuous (Right to Left)": "連續（從右到左）",
     "Continuous (Top to Bottom)": "連續（從上到下）",
     "Auto page turning interval": "自動翻頁間隔",
+    "The number of pic in screen (Only Gallery Mode)": "同螢幕圖片數量(僅畫廊模式)",
     "Theme Mode": "主題模式",
     "System": "系統",
     "Light": "浅色",