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/ChapterRuntime/RDEPUBChapterRuntimeStore.swift

@@ -12,6 +12,10 @@ final class RDEPUBChapterRuntimeStore {
 
     private let chapterLoadQueueKey = DispatchSpecificKey<Void>()
 
+    // M-02: currentSpineIndex and windowSpineIndices are accessed only from the main thread
+    // (verified by audit of all 7 access points). They are not protected by locks unlike
+    // navigationLock/prefetchLock/buildingLock/cfiMapLock, but this is safe as long as
+    // access remains main-thread-only. Do NOT access from chapterLoadQueue.
     private(set) var currentSpineIndex: Int?
 
     private(set) var windowSpineIndices: [Int] = []
@@ -39,6 +43,7 @@ final class RDEPUBChapterRuntimeStore {
     init() {
 
         imageCache.countLimit = 50
+        imageCache.totalCostLimit = 104_857_600  // 100 MB
 
         chapterLoadQueue.setSpecific(key: chapterLoadQueueKey, value: ())
     }