将 PDF 成品阅读控制器下沉为 RDPDFReaderView SDK，并修复手机横屏单页连续竖滑

SDK 化收尾：
- 新增 RDPDFReaderView 本地 pod（阅读容器、成品控制器、划线/注释、画笔、
  目录/设置面板、主题与持久化契约），Demo 精简为 PDFKit 页面提供者 + 持久化宿主
- Podfile/工程接入 RDPDFReaderView 与 SnapKit，示例书改用 PDF 阅读器示例文件

手机横屏单页竖滑修复：
- cell 高度改为宽度适配后的纸张高度（sizeForItemAt + 宿主按页提供纵横比），
  纵向超出一屏的内容由外层 collectionView 连续滚动承接，不再被裁掉
- 页面内部不再开启同向嵌套的兜底竖向拖动，修复外层滚动被吞、无法滚到下一页
- 修复 applyContentSize 先评估拖动开关后写 contentSize 的顺序缺陷
- 页码按视口中心命中 cell 计算，补 didEndDragging 兜底；旋转重锚点与
  transitionToPage 改用真实布局位置
- 横竖屏同为竖滑时也重建 cell 并刷新全部可见页的适配配置
- 横屏单页点击不再跳页，只显隐工具栏；翻页交给连续竖滑

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

ReadViewDemo/Pods/Target Support Files/Pods-ReadViewDemo/Pods-ReadViewDemo.debug.xcconfig

@@ -1,12 +1,12 @@
 ALWAYS_EMBED_SWIFT_STANDARD_LIBRARIES = YES
 CLANG_WARN_QUOTED_INCLUDE_IN_FRAMEWORK_HEADER = NO
-FRAMEWORK_SEARCH_PATHS = $(inherited) "${PODS_CONFIGURATION_BUILD_DIR}/DTCoreText" "${PODS_CONFIGURATION_BUILD_DIR}/DTFoundation" "${PODS_CONFIGURATION_BUILD_DIR}/RDEpubReaderView" "${PODS_CONFIGURATION_BUILD_DIR}/ZIPFoundation"
+FRAMEWORK_SEARCH_PATHS = $(inherited) "${PODS_CONFIGURATION_BUILD_DIR}/DTCoreText" "${PODS_CONFIGURATION_BUILD_DIR}/DTFoundation" "${PODS_CONFIGURATION_BUILD_DIR}/RDEpubReaderView" "${PODS_CONFIGURATION_BUILD_DIR}/RDPDFReaderView" "${PODS_CONFIGURATION_BUILD_DIR}/SnapKit" "${PODS_CONFIGURATION_BUILD_DIR}/ZIPFoundation"
 GCC_PREPROCESSOR_DEFINITIONS = $(inherited) COCOAPODS=1
-HEADER_SEARCH_PATHS = $(inherited) "${PODS_CONFIGURATION_BUILD_DIR}/DTCoreText/DTCoreText.framework/Headers" "${PODS_CONFIGURATION_BUILD_DIR}/DTFoundation/DTFoundation.framework/Headers" "${PODS_CONFIGURATION_BUILD_DIR}/RDEpubReaderView/RDEpubReaderView.framework/Headers" "${PODS_CONFIGURATION_BUILD_DIR}/ZIPFoundation/ZIPFoundation.framework/Headers" "$(SDKROOT)/usr/include/libxml2"
+HEADER_SEARCH_PATHS = $(inherited) "${PODS_CONFIGURATION_BUILD_DIR}/DTCoreText/DTCoreText.framework/Headers" "${PODS_CONFIGURATION_BUILD_DIR}/DTFoundation/DTFoundation.framework/Headers" "${PODS_CONFIGURATION_BUILD_DIR}/RDEpubReaderView/RDEpubReaderView.framework/Headers" "${PODS_CONFIGURATION_BUILD_DIR}/RDPDFReaderView/RDPDFReaderView.framework/Headers" "${PODS_CONFIGURATION_BUILD_DIR}/SnapKit/SnapKit.framework/Headers" "${PODS_CONFIGURATION_BUILD_DIR}/ZIPFoundation/ZIPFoundation.framework/Headers" "$(SDKROOT)/usr/include/libxml2"
 LD_RUNPATH_SEARCH_PATHS = $(inherited) /usr/lib/swift '@executable_path/Frameworks' '@loader_path/Frameworks'
-LIBRARY_SEARCH_PATHS = $(inherited) "${TOOLCHAIN_DIR}/usr/lib/swift/${PLATFORM_NAME}" /usr/lib/swift
-OTHER_LDFLAGS = $(inherited) -l"xml2" -framework "CoreGraphics" -framework "CoreText" -framework "DTCoreText" -framework "DTFoundation" -framework "ImageIO" -framework "MediaPlayer" -framework "QuartzCore" -framework "RDEpubReaderView" -framework "ZIPFoundation"
-OTHER_MODULE_VERIFIER_FLAGS = $(inherited) "-F${PODS_CONFIGURATION_BUILD_DIR}/DTCoreText" "-F${PODS_CONFIGURATION_BUILD_DIR}/DTFoundation" "-F${PODS_CONFIGURATION_BUILD_DIR}/RDEpubReaderView" "-F${PODS_CONFIGURATION_BUILD_DIR}/ZIPFoundation"
+LIBRARY_SEARCH_PATHS = $(inherited) "${TOOLCHAIN_DIR}/usr/lib/swift/${PLATFORM_NAME}" /usr/lib/swift $(SDKROOT)/usr/lib/swift
+OTHER_LDFLAGS = $(inherited) -l"swiftCoreGraphics" -l"xml2" -framework "CoreGraphics" -framework "CoreImage" -framework "CoreText" -framework "DTCoreText" -framework "DTFoundation" -framework "ImageIO" -framework "MediaPlayer" -framework "QuartzCore" -framework "RDEpubReaderView" -framework "RDPDFReaderView" -framework "SnapKit" -framework "Vision" -framework "ZIPFoundation"
+OTHER_MODULE_VERIFIER_FLAGS = $(inherited) "-F${PODS_CONFIGURATION_BUILD_DIR}/DTCoreText" "-F${PODS_CONFIGURATION_BUILD_DIR}/DTFoundation" "-F${PODS_CONFIGURATION_BUILD_DIR}/RDEpubReaderView" "-F${PODS_CONFIGURATION_BUILD_DIR}/RDPDFReaderView" "-F${PODS_CONFIGURATION_BUILD_DIR}/SnapKit" "-F${PODS_CONFIGURATION_BUILD_DIR}/ZIPFoundation"
 OTHER_SWIFT_FLAGS = $(inherited) -D COCOAPODS
 PODS_BUILD_DIR = ${BUILD_DIR}
 PODS_CONFIGURATION_BUILD_DIR = ${PODS_BUILD_DIR}/$(CONFIGURATION)$(EFFECTIVE_PLATFORM_NAME)