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/NodeMetadataStub.ts

@@ -1,7 +1,8 @@
+import type { ExecutableId } from '@/domain/Executables/Identifiable';
 import { type NodeMetadata, NodeType } from '@/presentation/components/Scripts/View/Tree/NodeContent/NodeMetadata';
 
 export class NodeMetadataStub implements NodeMetadata {
-  public id = 'stub-id';
+  public executableId: ExecutableId = 'stub-id';
 
   public readonly text: string = 'stub-text';
 
@@ -18,8 +19,8 @@ export class NodeMetadataStub implements NodeMetadata {
     return this;
   }
 
-  public withId(id: string): this {
-    this.id = id;
+  public withId(executableId: ExecutableId): this {
+    this.executableId = executableId;
     return this;
   }
 }