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/unit/shared/Stubs/RepositoryEntityStub.ts

@@ -0,0 +1,14 @@
+import type { RepositoryEntity, RepositoryEntityId } from '@/application/Repository/RepositoryEntity';
+
+export class RepositoryEntityStub implements RepositoryEntity {
+  public customProperty = 'customProperty';
+
+  public constructor(
+    public readonly id: RepositoryEntityId,
+  ) { }
+
+  public withCustomPropertyValue(value: string): RepositoryEntityStub {
+    this.customProperty = value;
+    return this;
+  }
+}