feat: EPUB阅读器搜索、注释、CFI模块及大书远距跳转优化

- 实现EPUB阅读器搜索功能及选中注释功能
- 优化CFI模块，修复代码审查发现的11个问题
- 实现大书远距目录跳转与后台补全优化方案
- 优化设置面板与章节运行时联动
- 重构及大量改进优化

Sources/RDReaderView/EPUBUI/TextPage/RDEPUBPageInteractionController.swift

@@ -4,17 +4,14 @@ import UIKit
 import DTCoreText
 #endif
 
-// MARK: - 页面交互控制器
-
-/// 页面交互控制器，负责文本层面的坐标映射与选择逻辑
-/// 在 DTCoreText 排版结果和用户交互之间充当桥梁
-/// 提供字符索引查找、选择范围计算、选择矩形计算等功能
 final class RDEPUBPageInteractionController {
 
     var snapshot: RDEPUBPageLayoutSnapshot?
+
     private var dtLayoutFrame: DTCoreTextLayoutFrame?
 
 #if canImport(DTCoreText)
+
     func configure(layoutFrame: DTCoreTextLayoutFrame?, page: RDEPUBTextPage?) {
         dtLayoutFrame = layoutFrame
         if let layoutFrame, let page {
@@ -25,9 +22,6 @@ final class RDEPUBPageInteractionController {
     }
 #endif
 
-    // MARK: - Hit Testing
-
-    /// 将视图坐标系的触摸点转为字符索引（对齐 WXRead 的 stringIndexForPoint:）
     func characterIndexForViewPoint(at viewPoint: CGPoint, in view: UIView) -> Int? {
         let localPoint = CGPoint(x: viewPoint.x, y: viewPoint.y)
         return characterIndex(at: localPoint)
@@ -36,7 +30,6 @@ final class RDEPUBPageInteractionController {
     func characterIndex(at point: CGPoint) -> Int? {
         guard let snapshot else { return nil }
 
-        // Attachment rect priority (6pt inset for easier tapping)
         for attachment in snapshot.attachments {
             if attachment.frame.insetBy(dx: -6, dy: -6).contains(point) {
                 return attachment.stringRange.location
@@ -63,8 +56,6 @@ final class RDEPUBPageInteractionController {
 #endif
     }
 
-    // MARK: - Selection Range
-
     func selectionRange(from startPoint: CGPoint, to endPoint: CGPoint) -> NSRange? {
         guard let start = characterIndex(at: startPoint),
               let end = characterIndex(at: endPoint) else { return nil }
@@ -73,8 +64,6 @@ final class RDEPUBPageInteractionController {
         return NSRange(location: lower, length: max(upper - lower, 1))
     }
 
-    // MARK: - Selection Rects
-
     func selectionRects(for absoluteRange: NSRange) -> [CGRect] {
         guard let snapshot else { return [] }
         var rects: [CGRect] = []
@@ -136,8 +125,6 @@ final class RDEPUBPageInteractionController {
         return CGRect(x: minX, y: minY, width: max(maxX - minX, 2), height: max(maxY - minY, 2))
     }
 
-    // MARK: - Caret Rect
-
     func caretRect(at index: Int) -> CGRect? {
         guard let snapshot else { return nil }
         guard let line = snapshot.lines.first(where: { NSLocationInRange(index, $0.stringRange) }) else {
@@ -159,8 +146,6 @@ final class RDEPUBPageInteractionController {
         )
     }
 
-    // MARK: - Private Helpers
-
     private func nearestLine(to point: CGPoint, in lines: [RDEPUBPageLine]) -> RDEPUBPageLine? {
         var bestLine: RDEPUBPageLine?
         var bestDistance: CGFloat = .greatestFiniteMagnitude
@@ -196,6 +181,7 @@ final class RDEPUBPageInteractionController {
     }
 
 #if canImport(DTCoreText)
+
     private func dtLineContaining(range: NSRange) -> DTCoreTextLayoutLine? {
         guard let dtLayoutFrame, let snapshot else { return nil }
         let localLocation = max(range.location - pageOffset(for: snapshot), 0)