Refactor to unify scripts/categories as Executable

This commit consolidates scripts and categories under a unified
'Executable' concept. This simplifies the architecture and improves code
readability.

- Introduce subfolders within `src/domain` to segregate domain elements.
- Update class and interface names by removing the 'I' prefix in
  alignment with new coding standards.
- Replace 'Node' with 'Executable' to clarify usage; reserve 'Node'
  exclusively for the UI's tree component.

tests/unit/shared/Stubs/ScriptCompilerStub.ts

@@ -1,16 +1,16 @@
 import type { ScriptData } from '@/application/collections/';
-import type { IScriptCompiler } from '@/application/Parser/Script/Compiler/IScriptCompiler';
-import type { IScriptCode } from '@/domain/IScriptCode';
+import type { IScriptCompiler } from '@/application/Parser/Executable/Script/Compiler/IScriptCompiler';
+import type { ScriptCode } from '@/domain/Executables/Script/Code/ScriptCode';
 import { ScriptCodeStub } from './ScriptCodeStub';
 
 export class ScriptCompilerStub implements IScriptCompiler {
-  public compilableScripts = new Map<ScriptData, IScriptCode>();
+  public compilableScripts = new Map<ScriptData, ScriptCode>();
 
   public canCompile(script: ScriptData): boolean {
     return this.compilableScripts.has(script);
   }
 
-  public compile(script: ScriptData): IScriptCode {
+  public compile(script: ScriptData): ScriptCode {
     const foundCode = this.compilableScripts.get(script);
     if (foundCode) {
       return foundCode;
@@ -18,7 +18,7 @@ export class ScriptCompilerStub implements IScriptCompiler {
     return new ScriptCodeStub();
   }
 
-  public withCompileAbility(script: ScriptData, result?: IScriptCode): this {
+  public withCompileAbility(script: ScriptData, result?: ScriptCode): this {
     this.compilableScripts.set(
       script,
       result ?? { execute: `compiled code of ${script.name}`, revert: `compiled revert code of ${script.name}` },