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

ReadViewDemo/ReadViewDemoUITests/ReaderUITests/AsyncChapterLoadingTests.swift

@@ -394,6 +394,10 @@ final class AsyncChapterLoadingTests: XCTestCase {
             for _ in 0..<10 {
                 paging.swipeLeft()
                 RunLoop.current.run(until: Date().addingTimeInterval(0.4))
+                XCTAssertTrue(
+                    app.activityIndicators[IDs.readerLoadingSpinner].waitForNonExistence(timeout: 10),
+                    "横屏翻页后的页面不应一直停留在 loading"
+                )
             }
         }
 

ReadViewDemo/ReadViewDemoUITests/ReaderUITests/FixedLayoutRotationTests.swift

@@ -0,0 +1,33 @@
+import XCTest
+
+/// 固定布局（pre-paginated）书籍的旋转回归：
+/// 每次旋转会使预加载缓存签名失效并批量丢弃 WKWebView 页面，
+/// 历史上曾因 script message handler 保留环导致 WebView 泄漏累积，
+/// 多次旋转后在 CA commit 阶段 abort（CA::Render::Encoder::grow）。
+final class FixedLayoutRotationTests: XCTestCase {
+    private let app = XCUIApplication()
+
+    override func setUpWithError() throws {
+        continueAfterFailure = false
+        XCUIDevice.shared.orientation = .portrait
+    }
+
+    override func tearDownWithError() throws {
+        XCUIDevice.shared.orientation = .portrait
+    }
+
+    func testFixedLayoutBookSurvivesRepeatedRotation() {
+        app.launchAndOpenSampleBook(bookTitleQuery: "熊爷爷")
+        app.waitForReader()
+
+        for _ in 0..<3 {
+            XCUIDevice.shared.orientation = .landscapeLeft
+            RunLoop.current.run(until: Date().addingTimeInterval(2))
+            XCUIDevice.shared.orientation = .portrait
+            RunLoop.current.run(until: Date().addingTimeInterval(2))
+        }
+
+        XCTAssertEqual(app.state, .runningForeground, "反复旋转后 app 已退出（疑似崩溃）")
+        app.waitForReader()
+    }
+}