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/SelectedScriptStub.ts

@@ -1,17 +1,18 @@
 import type { SelectedScript } from '@/application/Context/State/Selection/Script/SelectedScript';
+import type { RepositoryEntityId } from '@/application/Repository/RepositoryEntity';
 import type { Script } from '@/domain/Executables/Script/Script';
 
 export class SelectedScriptStub implements SelectedScript {
   public readonly script: Script;
 
-  public readonly id: string;
+  public readonly id: RepositoryEntityId;
 
   public revert: boolean;
 
   constructor(
     script: Script,
   ) {
-    this.id = script.id;
+    this.id = script.executableId;
     this.script = script;
   }