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/ReaderView/Paging/RDReaderPreloadController.swift

@@ -1,6 +1,10 @@
 
 import UIKit
 
+protocol RDReaderCachePolicyProviding {
+    var shouldAvoidReaderPageCaching: Bool { get }
+}
+
 final class RDReaderPreloadController {
 
     var radius: Int = 2
@@ -76,7 +80,11 @@ final class RDReaderPreloadController {
     ) -> UIView {
         let reusableView = detachedReusablePageView(for: pageNum)
         let view = contentViewProvider(pageNum, reusableView) ?? reusableView ?? UIView()
-        pageCurlCachedViews[pageNum] = view
+        if shouldCache(view: view, for: pageNum, environment: environment) {
+            pageCurlCachedViews[pageNum] = view
+        } else {
+            pageCurlCachedViews.removeValue(forKey: pageNum)
+        }
         return view
     }
 
@@ -105,12 +113,20 @@ final class RDReaderPreloadController {
         for targetPage in targets {
             let existing = detachedReusablePageView(for: targetPage)
             let contentView = contentViewProvider(targetPage, existing) ?? existing ?? UIView()
-            preloadedPageViews[targetPage] = contentView
+            let shouldCacheContentView = shouldCache(view: contentView, for: targetPage, environment: environment)
+            if shouldCacheContentView {
+                preloadedPageViews[targetPage] = contentView
+            } else {
+                preloadedPageViews.removeValue(forKey: targetPage)
+            }
             if contentView.superview !== preloadHostView {
                 contentView.removeFromSuperview()
                 preloadHostView.addSubview(contentView)
             }
             contentView.frame = preloadHostView.bounds
+            if !shouldCacheContentView {
+                contentView.removeFromSuperview()
+            }
         }
     }
 
@@ -139,6 +155,14 @@ final class RDReaderPreloadController {
             && pageNum < environment.totalPages
     }
 
+    private func shouldCache(view: UIView, for pageNum: Int, environment: Environment) -> Bool {
+        guard shouldCachePage(pageNum, environment: environment) else { return false }
+        if let policyProvider = view as? RDReaderCachePolicyProviding {
+            return !policyProvider.shouldAvoidReaderPageCaching
+        }
+        return true
+    }
+
     private func isDualPage(environment: Environment) -> Bool {
         environment.landscapeDualPageEnabled
             && environment.isLandscape