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"
+                )
             }
         }