refactor: delete storybook epub service

#2266

Author: jo-elimu

pom-dependency-tree.txt

@@ -1,4 +1,4 @@
-ai.elimu:webapp:war:2.6.97-SNAPSHOT
+ai.elimu:webapp:war:2.6.98-SNAPSHOT
 +- ai.elimu:model:jar:model-2.0.114:compile
 |  \- com.google.code.gson:gson:jar:2.13.1:compile
 |     \- com.google.errorprone:error_prone_annotations:jar:2.38.0:compile

src/main/java/ai/elimu/service/storybook/StoryBookEPubService.java

@@ -16,7 +16,6 @@
 import ai.elimu.model.v2.enums.Language;
 import ai.elimu.model.v2.enums.ReadingLevel;
 import ai.elimu.model.v2.enums.content.ImageFormat;
-import ai.elimu.service.storybook.StoryBookEPubService;
 import ai.elimu.util.ChecksumHelper;
 import ai.elimu.util.ConfigHelper;
 import ai.elimu.util.DiscordHelper;
@@ -84,8 +83,6 @@ public class StoryBookCreateFromEPubController {
 
   private final StoryBookParagraphDao storyBookParagraphDao;
 
-  private final StoryBookEPubService storyBookEPubService;
-
   @GetMapping
   public String handleRequest(Model model) {
     log.info("handleRequest");
@@ -235,7 +232,7 @@ public String handleSubmit(
           throw new IllegalArgumentException("The TOC file was not found");
         } else {
           List<String> chapterReferences = null;
-          if (storyBookEPubService.isTableOfContentsFileHtmlLike(tableOfContentsFile.getName())) {
+          if (tableOfContentsFile.getName().endsWith(".xhtml") || tableOfContentsFile.getName().endsWith(".html")) {
             // StoryBookProvider#GLOBAL_DIGITAL_LIBRARY or StoryBookProvider#LETS_READ_ASIA
             chapterReferences = EPubChapterExtractionHelper.extractChapterReferencesFromTableOfContentsFile(tableOfContentsFile);
           } else if (tableOfContentsFile.getName().endsWith(".ncx")) {