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.

src/domain/Executables/Script/Code/DistinctReversibleScriptCode.ts

@@ -0,0 +1,31 @@
+import type { ScriptCode } from './ScriptCode';
+
+export class DistinctReversibleScriptCode implements ScriptCode {
+  constructor(
+    public readonly execute: string,
+    public readonly revert: string | undefined,
+  ) {
+    validateCode(execute);
+    validateRevertCode(revert, execute);
+  }
+}
+
+function validateRevertCode(revertCode: string | undefined, execute: string) {
+  if (!revertCode) {
+    return;
+  }
+  try {
+    validateCode(revertCode);
+    if (execute === revertCode) {
+      throw new Error('Code itself and its reverting code cannot be the same');
+    }
+  } catch (err) {
+    throw Error(`(revert): ${err.message}`);
+  }
+}
+
+function validateCode(code: string): void {
+  if (code.length === 0) {
+    throw new Error('missing code');
+  }
+}

src/domain/Executables/Script/Code/ScriptCode.ts

@@ -0,0 +1,4 @@
+export interface ScriptCode {
+  readonly execute: string;
+  readonly revert?: string;
+}

src/domain/Executables/Script/Code/ScriptCodeFactory.ts

@@ -0,0 +1,12 @@
+import { DistinctReversibleScriptCode } from './DistinctReversibleScriptCode';
+import type { ScriptCode } from './ScriptCode';
+
+export interface ScriptCodeFactory {
+  (
+    ...args: ConstructorParameters<typeof DistinctReversibleScriptCode>
+  ): ScriptCode;
+}
+
+export const createScriptCode: ScriptCodeFactory = (
+  ...args
+) => new DistinctReversibleScriptCode(...args);

src/domain/Executables/Script/CollectionScript.ts

@@ -0,0 +1,40 @@
+import { BaseEntity } from '@/infrastructure/Entity/BaseEntity';
+import { RecommendationLevel } from './RecommendationLevel';
+import type { Script } from './Script';
+import type { ScriptCode } from './Code/ScriptCode';
+
+export class CollectionScript extends BaseEntity<string> implements Script {
+  public readonly name: string;
+
+  public readonly code: ScriptCode;
+
+  public readonly docs: ReadonlyArray<string>;
+
+  public readonly level?: RecommendationLevel;
+
+  constructor(parameters: ScriptInitParameters) {
+    super(parameters.name);
+    this.name = parameters.name;
+    this.code = parameters.code;
+    this.docs = parameters.docs;
+    this.level = parameters.level;
+    validateLevel(parameters.level);
+  }
+
+  public canRevert(): boolean {
+    return Boolean(this.code.revert);
+  }
+}
+
+export interface ScriptInitParameters {
+  readonly name: string;
+  readonly code: ScriptCode;
+  readonly docs: ReadonlyArray<string>;
+  readonly level?: RecommendationLevel;
+}
+
+function validateLevel(level?: RecommendationLevel) {
+  if (level !== undefined && !(level in RecommendationLevel)) {
+    throw new Error(`invalid level: ${level}`);
+  }
+}

src/domain/Executables/Script/RecommendationLevel.ts

@@ -0,0 +1,4 @@
+export enum RecommendationLevel {
+  Standard = 0,
+  Strict = 1,
+}

src/domain/Executables/Script/Script.ts

@@ -0,0 +1,11 @@
+import { RecommendationLevel } from './RecommendationLevel';
+import type { Executable } from '../Executable';
+import type { Documentable } from '../Documentable';
+import type { ScriptCode } from './Code/ScriptCode';
+
+export interface Script extends Executable<string>, Documentable {
+  readonly name: string;
+  readonly level?: RecommendationLevel;
+  readonly code: ScriptCode;
+  canRevert(): boolean;
+}