Remove unused components and models for improved maintainability

- Deleted redundant components (`AddActionButton`, `AlertBox`, `AlertStack`, `BackButton`, `CancelButton`, and `CollapsableArea`) and related files.
- Removed unused models (`Book`, `BookSerie`, `BookTables`, `Character`, and `Chapter`) to reduce codebase clutter.
- Updated project structure and references to reflect these removals.

lib/constants/chapter.ts

@@ -0,0 +1,9 @@
+import {SelectBoxProps} from "@/components/form/SelectBox";
+
+export const chapterVersions: SelectBoxProps[] = [
+    {value: '1', label: 'chapterVersions.prompt'},
+    {value: '2', label: 'chapterVersions.draft'},
+    {value: '3', label: 'chapterVersions.refine'},
+    {value: '4', label: 'chapterVersions.review'},
+    {value: '5', label: 'chapterVersions.final'},
+];