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/EPUBCore/CFI/RDEPUBCFIResolver.swift

@@ -28,7 +28,7 @@ public enum RDEPUBCFIResolver {
         if cfi.packagePath.steps.count >= 3 {
             manifestStep = cfi.packagePath.steps[2]
         } else {
-            manifestStep = cfi.packagePath.steps.last(where: { $0.idAssertion?.rd_cfiNilIfEmpty != nil })
+            manifestStep = cfi.packagePath.steps.last(where: { $0.idAssertion?.rd_nilIfEmpty != nil })
         }
         let href = manifestStep?.idAssertion
 
@@ -40,7 +40,7 @@ public enum RDEPUBCFIResolver {
             fileIndex = nil
         }
 
-        let fragmentID = cfi.contentPath.steps.last(where: { $0.idAssertion?.rd_cfiNilIfEmpty != nil })?.idAssertion
+        let fragmentID = cfi.contentPath.steps.last(where: { $0.idAssertion?.rd_nilIfEmpty != nil })?.idAssertion
         return RDEPUBCFIResolverResult(
             href: href,
             fileIndex: fileIndex,