refactor: rename RDReaderView -> RDEpubReaderView, update pod config and docs

- Rename source module from RDReaderView to RDEpubReaderView
- Move all source files from Sources/RDReaderView/ to Sources/RDEpubReaderView/
- Update podspec: RDReaderView.podspec -> RDEpubReaderView.podspec
- Update Podfile, demo project, and CocoaPods config for new pod name
- Delete old RDReaderView pod support files from ReadViewDemo/Pods
- Add new RDEpubReaderView pod support files
- Update documentation (API ref, architecture, UML, conventions, etc.)
- Add FixedLayoutRotationTests
- Update .gitignore: exclude .DS_Store, manual unpack backups, _ssoft-output

Sources/RDEpubReaderView/EPUBCore/CFI/RDEPUBCFITextAssertion.swift

@@ -0,0 +1,22 @@
+import Foundation
+
+public struct RDEPUBCFITextAssertion: Codable, Equatable, Hashable {
+
+    public var prefix: String?
+
+    public var exact: String?
+
+    public var suffix: String?
+
+    public init(prefix: String? = nil, exact: String? = nil, suffix: String? = nil) {
+        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
+    }
+}