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

ReadViewDemo/ReadViewDemoUITests/ReaderUITests/SearchTests.swift

@@ -264,10 +264,11 @@ final class SearchTests: XCTestCase {
 
         // 验证当前匹配的文本就是搜索关键字
         let state = app.waitForDemoReaderState(timeout: 5, description: "searchMatchText exists") {
-            $0.searchMatchText != nil && $0.searchMatchText != "none"
+            $0.searchMatchText != nil && $0.searchMatchText != "none" && $0.rangeCFI?.isEmpty == false
         }
         XCTAssertEqual(state.searchMatchText, keyword,
             "当前搜索匹配文本应为 '\(keyword)'，实际：\(state.searchMatchText ?? "nil")")
+        XCTAssertNotNil(state.rangeCFI, "搜索命中应暴露 rangeCFI 以支持重排恢复")
     }
 
     /// 重排后搜索匹配文本仍应与关键字一致
@@ -280,6 +281,10 @@ final class SearchTests: XCTestCase {
         // 等待搜索结果
         let countLabel = app.staticTexts[IDs.searchCount]
         XCTAssertTrue(countLabel.waitForExistence(timeout: 10), "搜索计数应出现")
+        let stateBefore = app.waitForDemoReaderState(timeout: 5, description: "search rangeCFI before repagination") {
+            $0.rangeCFI?.isEmpty == false
+        }
+        let rangeCFIBefore = stateBefore.rangeCFI
 
         // 改变字体触发重排
         app.showReaderChromeIfNeeded()
@@ -314,10 +319,11 @@ final class SearchTests: XCTestCase {
 
         // 验证重排后匹配文本仍正确
         let state = app.waitForDemoReaderState(timeout: 5, description: "searchMatchText after repagination") {
-            $0.searchMatchText != nil && $0.searchMatchText != "none"
+            $0.searchMatchText != nil && $0.searchMatchText != "none" && $0.rangeCFI?.isEmpty == false
         }
         XCTAssertEqual(state.searchMatchText, keyword,
             "重排后搜索匹配文本应为 '\(keyword)'，实际：\(state.searchMatchText ?? "nil")")
+        XCTAssertEqual(state.rangeCFI, rangeCFIBefore, "重排后当前搜索命中的 rangeCFI 应保持一致")
     }
 
     // MARK: - 重排后搜索跳转正确性
@@ -371,9 +377,10 @@ final class SearchTests: XCTestCase {
         nextButton.tap()
         Thread.sleep(forTimeInterval: 0.5)
         let stateMatch2 = app.waitForDemoReaderState(timeout: 5, description: "match 2 page") {
-            ($0.page ?? 0) > 0
+            ($0.page ?? 0) > 0 && $0.rangeCFI?.isEmpty == false
         }
         let pageAtMatch2 = stateMatch2.page ?? 1
+        let rangeCFIAtMatch2 = stateMatch2.rangeCFI
 
         // 翻到其他页
         let content = app.otherElements[IDs.readerContent].firstMatch
@@ -389,9 +396,10 @@ final class SearchTests: XCTestCase {
         nextButton.tap()
         Thread.sleep(forTimeInterval: 0.5)
         let stateMatch3 = app.waitForDemoReaderState(timeout: 5, description: "match 3 page") {
-            ($0.page ?? 0) > 0
+            ($0.page ?? 0) > 0 && $0.rangeCFI?.isEmpty == false
         }
         let pageAtMatch3 = stateMatch3.page ?? 1
+        let rangeCFIAtMatch3 = stateMatch3.rangeCFI
 
         // 再翻到其他页
         if content.waitForExistence(timeout: 3) {
@@ -406,10 +414,12 @@ final class SearchTests: XCTestCase {
         prevButton.tap()
         Thread.sleep(forTimeInterval: 0.5)
         let stateBack2 = app.waitForDemoReaderState(timeout: 5, description: "back to match 2") {
-            $0.page == pageAtMatch2
+            $0.page == pageAtMatch2 && $0.rangeCFI == rangeCFIAtMatch2
         }
         XCTAssertEqual(stateBack2.page, pageAtMatch2,
             "重排后搜索跳回第 2 个匹配应回到第 \(pageAtMatch2) 页，实际：\(stateBack2.page ?? -1)")
+        XCTAssertEqual(stateBack2.rangeCFI, rangeCFIAtMatch2,
+            "重排后搜索跳回第 2 个匹配应命中同一段文本")
 
         // 再翻到其他页
         if content.waitForExistence(timeout: 3) {
@@ -424,10 +434,12 @@ final class SearchTests: XCTestCase {
         nextButton.tap()
         Thread.sleep(forTimeInterval: 0.5)
         let stateBack3 = app.waitForDemoReaderState(timeout: 5, description: "back to match 3") {
-            $0.page == pageAtMatch3
+            $0.page == pageAtMatch3 && $0.rangeCFI == rangeCFIAtMatch3
         }
         XCTAssertEqual(stateBack3.page, pageAtMatch3,
             "重排后搜索跳到第 3 个匹配应回到第 \(pageAtMatch3) 页，实际：\(stateBack3.page ?? -1)")
+        XCTAssertEqual(stateBack3.rangeCFI, rangeCFIAtMatch3,
+            "重排后搜索跳到第 3 个匹配应命中同一段文本")
     }
 
     // MARK: - 辅助方法