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/RDEPUBCFIRange.swift

@@ -0,0 +1,34 @@
+import Foundation
+
+public struct RDEPUBCFIRange: Codable, Equatable, Hashable {
+    public var parent: RDEPUBCFI?
+    public var start: RDEPUBCFI
+    public var end: RDEPUBCFI
+
+    /// Always computed from components — no stale cached value risk.
+    public var rawValue: String {
+        RDEPUBCFISerializer.serializeRange(self)
+    }
+
+    /// Initialize from components. The `rawValue` parameter is ignored — rawValue is always
+    /// computed from the components. To parse a CFI range string, use `RDEPUBCFIParser.parseRange(_:)`.
+    public init(rawValue: String = "", parent: RDEPUBCFI? = nil, start: RDEPUBCFI, end: RDEPUBCFI) {
+        self.parent = parent
+        self.start = start
+        self.end = end
+    }
+
+    public init(from decoder: Decoder) throws {
+        let container = try decoder.singleValueContainer()
+        let rawValue = try container.decode(String.self)
+        let parsed = try RDEPUBCFIParser.parseRange(rawValue)
+        self.parent = parsed.parent
+        self.start = parsed.start
+        self.end = parsed.end
+    }
+
+    public func encode(to encoder: Encoder) throws {
+        var container = encoder.singleValueContainer()
+        try container.encode(rawValue)
+    }
+}