fix: 屏幕方向和屏幕超时设置切换后不立即生效

MoreConfigSheet 中屏幕方向和屏幕超时的变更只写入 DataStore，需经过
6 步异步传播（DataStore → Flow → ViewModel → Effect → Controller）
才能生效，导致：
- 切换横屏后文字显示不全，仍保持竖屏布局
- 目录不跟随横屏显示
- 屏幕超时设置延迟生效

修复：
- 新增 ReadBookIntent.SetOrientation 意图，直接写入 ReadConfig 并发射 Effect
- 将 ReadBookIntent.KeepLightChanged 改为带值的 data class，同理直接生效
- MoreConfigSheet 在写 DataStore 的同时同步调用 onIntent，立即应用变更
- 新增反向横屏（REVERSE_LANDSCAPE）选项

app/src/main/java/io/legado/app/ui/book/read/ReadBookContract.kt

@@ -425,7 +425,8 @@ sealed interface ReadBookIntent {
     data class TextActionDict(val text: String) : ReadBookIntent
 
     // Screen / selection config
-    data object KeepLightChanged : ReadBookIntent
+    data class KeepLightChanged(val value: String) : ReadBookIntent
+    data class SetOrientation(val value: String) : ReadBookIntent
     data class TextSelectAbleChanged(val enabled: Boolean) : ReadBookIntent
 
     // Media / TTS

app/src/main/java/io/legado/app/ui/book/read/ReadBookViewModel.kt

@@ -35,6 +35,7 @@ import io.legado.app.domain.usecase.GetReadingProgressUseCase
 import io.legado.app.domain.usecase.UploadReadingProgressUseCase
 import io.legado.app.exception.NoStackTraceException
 import io.legado.app.help.DefaultData
+import io.legado.app.ui.config.readConfig.ReadConfig
 import io.legado.app.help.book.BookHelp
 import io.legado.app.help.book.ContentProcessor
 import io.legado.app.help.book.isEpub
@@ -581,7 +582,15 @@ class ReadBookViewModel(
             is ReadBookIntent.SaveMenuButtonConfig -> saveMenuButtonConfig(intent.items)
             is ReadBookIntent.SaveTitleBarButtonConfig -> saveTitleBarButtonConfig(intent.items)
 
-            is ReadBookIntent.KeepLightChanged -> _effects.tryEmit(ReadBookEffect.UpScreenTimeOut)
+            is ReadBookIntent.KeepLightChanged -> {
+                ReadConfig.keepLight = intent.value
+                _readPreferences.update { it.copy(keepLight = intent.value) }
+                _effects.tryEmit(ReadBookEffect.UpScreenTimeOut)
+            }
+            is ReadBookIntent.SetOrientation -> {
+                ReadConfig.screenOrientation = intent.value
+                _effects.tryEmit(ReadBookEffect.SetOrientation)
+            }
             is ReadBookIntent.TextSelectAbleChanged -> _effects.tryEmit(
                 ReadBookEffect.UpTextSelectAble(
                     intent.enabled

app/src/main/java/io/legado/app/ui/book/read/sheet/MoreConfigSheet.kt

@@ -56,9 +56,11 @@ fun MoreConfigSheet(
             ScreenSettings(
                 preferences = preferences,
                 onScreenOrientationChange = {
+                    onIntent(ReadBookIntent.SetOrientation(it))
                     scope.launch { readSettingsRepository.setScreenOrientation(it) }
                 },
                 onKeepLightChange = {
+                    onIntent(ReadBookIntent.KeepLightChanged(it))
                     scope.launch { readSettingsRepository.setKeepLight(it) }
                 },
                 onHideStatusBarChange = {