refactor: split reader architecture and chrome handling

Sources/RDReaderView/EPUBTextRendering/Pagination/RDEPUBTextPaginationInterfaces.swift

@@ -0,0 +1,28 @@
+import Foundation
+import UIKit
+
+// MARK: - 分页接口定义
+
+struct RDEPUBPageBreakDecision {
+    var range: NSRange
+    var reason: RDEPUBTextPageBreakReason
+    var diagnostics: [String]
+}
+
+protocol RDEPUBChapterPageCounting {
+    func pageRanges(
+        for attributedString: NSAttributedString,
+        pageSize: CGSize,
+        config: RDEPUBTextLayoutConfig,
+        fragmentOffsets: [String: Int]
+    ) -> [RDEPUBPageBreakDecision]
+}
+
+protocol RDEPUBPageFrameBuilding {
+    func makeFrames(
+        attributedString: NSAttributedString,
+        pageSize: CGSize,
+        config: RDEPUBTextLayoutConfig,
+        fragmentOffsets: [String: Int]
+    ) -> [RDEPUBTextLayoutFrame]
+}