Refactor executable IDs to use strings #262

This commit unifies executable ID structure across categories and
scripts, paving the way for more complex ID solutions for #262.
It also refactors related code to adapt to the changes.

Key changes:

- Change numeric IDs to string IDs for categories
- Use named types for string IDs to improve code clarity
- Add unit tests to verify ID uniqueness

Other supporting changes:

- Separate concerns in entities for data access and executables by using
  separate abstractions (`Identifiable` and `RepositoryEntity`)
- Simplify usage and construction of entities.
- Remove `BaseEntity` for simplicity.
- Move creation of categories/scripts to domain layer
- Refactor CategoryCollection for better validation logic isolation
- Rename some categories to keep the names (used as pseudo-IDs) unique
  on Windows.

tests/integration/presentation/components/Scripts/View/Tree/NodeContent/Markdown/CompositeMarkdownRenderer.spec.ts

@@ -225,7 +225,7 @@ function collectAllDocumentedExecutables(): DocumentedExecutable[] {
   ]);
   const allDocumentedExecutables = allExecutables.filter((e) => e.docs.length > 0);
   return allDocumentedExecutables.map((executable): DocumentedExecutable => ({
-    executableLabel: `${executable.name} (${executable.id})`,
+    executableLabel: `${executable.name} (${executable.executableId})`,
     docs: executable.docs.join('\n'),
   }));
 }