feat: chapter runtime refactoring and related updates

- Refactor chapter runtime: replace window coordinator/snapshot with warmup orchestrator
- Update EPUB core: parser, reading session, JS bridge, navigator layout
- Update reader controller: data source, location resolution, persistence
- Update chapter runtime: data cache, loader, runtime store, disk cache, warmup orchestrator
- Remove deprecated navigation state machine and pagination state
- Update text rendering: book cache, HTML normalizer
- Update UI: text content view, dark image adjuster, text selection controller
- Update settings and reader configuration
- Add CODE_REVIEW.md and AUDIT_FINAL.md documentation
- Update pod dependencies (remove SSAlertSwift, SnapKit)
- Update podspec and pod configuration files

Co-Authored-By: Claude <noreply@anthropic.com>

Sources/RDReaderView/EPUBUI/ReaderController/RDEPUBReaderState.swift

@@ -1,5 +1,9 @@
 import UIKit
 
+/// M-01: All properties must be accessed exclusively from the main thread.
+/// This is currently enforced by convention — all verified access paths are main-thread-only.
+/// Adding @MainActor would formalize this but requires iOS 15+ and Swift concurrency throughout.
+/// For now, rely on the audit-verified access patterns and consider @MainActor in a future refactor.
 final class RDEPUBReaderState {
 
     var parser: RDEPUBParser?
@@ -20,8 +24,6 @@ final class RDEPUBReaderState {
 
     var paginationToken = UUID()
 
-    var paginator: RDEPUBPaginator?
-
     var searchState: RDEPUBSearchState?
 
     var pendingPageMapUpdates: [RDEPUBPendingPageMapUpdate] = []