feat(reader): 增强阅读器功能与 UI 测试支持

- 新增字体选择（系统/宋体/圆体/等宽）与暗色图片柔化配置
- 文本选择改为自定义手势+操作栏（拷贝/高亮/批注）
- 添加 accessibilityIdentifier 支持自动化 UI 测试
- 新增 UITests 覆盖阅读器打开/关闭、工具栏、设置面板、批注等
- 添加 Demo 测试用 EPUB 书源（宝山辽墓材料与释读）
- 新增文档：UI 自动化测试、功能开发计划、阅读器规划

Sources/RDReaderView/EPUBUI/RDEPUBReaderController+RuntimeBridge.swift

@@ -158,6 +158,7 @@ extension RDEPUBReaderController {
         to newConfiguration: RDEPUBReaderConfiguration
     ) -> Bool {
         oldConfiguration.fontSize != newConfiguration.fontSize ||
+        oldConfiguration.fontChoice != newConfiguration.fontChoice ||
         oldConfiguration.lineHeightMultiple != newConfiguration.lineHeightMultiple ||
         oldConfiguration.numberOfColumns != newConfiguration.numberOfColumns ||
         oldConfiguration.columnGap != newConfiguration.columnGap ||
@@ -172,7 +173,9 @@ extension RDEPUBReaderController {
         from oldConfiguration: RDEPUBReaderConfiguration,
         to newConfiguration: RDEPUBReaderConfiguration
     ) -> Bool {
-        oldConfiguration.theme != newConfiguration.theme
+        oldConfiguration.theme != newConfiguration.theme ||
+        oldConfiguration.darkImageAdjustmentEnabled != newConfiguration.darkImageAdjustmentEnabled ||
+        oldConfiguration.darkImageBlendRatio != newConfiguration.darkImageBlendRatio
     }
 
     func presentTableOfContents() {
@@ -180,7 +183,6 @@ extension RDEPUBReaderController {
     }
 
     func handleBackAction() {
-        print("[Debug] handleBackAction called")
         runtime.handleBackAction()
     }
 
@@ -231,4 +233,3 @@ extension RDEPUBReaderController: UIGestureRecognizerDelegate {
         true
     }
 }
-