feat: 交互协调器拆分、附件提示、暗色图片适配、选区放大镜及文档清理

- 拆分 ContentDelegates/TextContentView 为独立协调器（InteractionCoordinator、LocationResolution、ExternalLinks、AttachmentTooltip）
- 新增 RDEPUBAttachmentTooltipView/OverlayView 附件气泡提示
- 新增 RDEPUBDarkImageAdjuster 暗色模式图片亮度适配
- 新增 RDEPUBSelectionLoupeView 选区放大镜
- 新增 MetadataParseWorker/CancellationController 元数据解析取消机制
- 重构 PresentationRuntime/PaginationCoordinator 精简职责
- 优化 ChapterLoader/WarmupOrchestrator 异步章节加载
- CFI 模块微调与 NoteModels 更新
- 清理冗余文档，更新架构/UML/业务逻辑文档

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

Sources/RDReaderView/EPUBUI/ReaderController/RDEPUBReaderRuntime.swift

@@ -105,7 +105,7 @@ final class RDEPUBReaderRuntime {
         context.readingSession = nil
         context.textBook = nil
         context.bookPageMap = nil
-        context.pendingFullPageMap = nil
+        context.pendingPageMapUpdates.removeAll()
         context.activeBookmarks = []
         context.activeHighlights = []
         context.searchState = nil
@@ -349,7 +349,7 @@ final class RDEPUBReaderRuntime {
     }
 
     func applyPendingFullPageMapIfNeeded() {
-        presentationRuntime.applyPendingFullPageMapIfNeeded()
+        presentationRuntime.commitPendingPageMapUpdateIfNeeded()
     }
 
     func finishPagination(restoreLocation: RDEPUBLocation?) {
@@ -605,7 +605,7 @@ final class RDEPUBReaderRuntime {
         paginationCoordinator.cancelActiveMetadataParseWork()
         chapterRuntimeStore.invalidateAllForSettingsChange()
         context.bookPageMap = nil
-        context.pendingFullPageMap = nil
+        context.pendingPageMapUpdates.removeAll()
         jumpSessionManager.clearSession()
         backgroundPriorityManager.reset()
         backgroundCoverageStore.clearAll()