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/EPUBCore/CFI/RDEPUBCFITextAssertion.swift

@@ -9,8 +9,14 @@ public struct RDEPUBCFITextAssertion: Codable, Equatable, Hashable {
     public var suffix: String?
 
     public init(prefix: String? = nil, exact: String? = nil, suffix: String? = nil) {
-        self.prefix = prefix?.nilIfEmpty
-        self.exact = exact?.nilIfEmpty
-        self.suffix = suffix?.nilIfEmpty
+        self.prefix = Self.trimmedOrNil(prefix)
+        self.exact = Self.trimmedOrNil(exact)
+        self.suffix = Self.trimmedOrNil(suffix)
+    }
+
+    private static func trimmedOrNil(_ value: String?) -> String? {
+        guard let value else { return nil }
+        let trimmed = value.trimmingCharacters(in: .whitespacesAndNewlines)
+        return trimmed.isEmpty ? nil : trimmed
     }
 }