Content Types: Introduce schema service to support future schema generation

[lauraneto]

Summary

• Adds IContentTypeSchemaService with methods to retrieve document and media type schema information
• Introduces ContentTypeSchemaInfo and ContentTypePropertySchemaInfo models for representing content type metadata
• Registers the service in the DI container via UmbracoBuilder

Purpose

Provides foundational infrastructure for content type schema generation, extracting relevant metadata (aliases, editor info, compositions, property types) into dedicated models that can be consumed by schema generators.

[Copilot]

Pull request overview

This PR introduces foundational infrastructure for content type schema generation by adding a new service (IContentTypeSchemaService) that extracts and provides metadata about document and media types. The service retrieves content type information (aliases, properties, compositions) from existing Umbraco services and transforms them into simplified schema information models suitable for future schema generation tools.

Key Changes

• Introduces IContentTypeSchemaService with methods to retrieve document and media type schema metadata
• Adds ContentTypeSchemaInfo and ContentTypePropertySchemaInfo models to encapsulate schema-relevant content type information
• Registers the new service in the DI container for application-wide access

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
src/Umbraco.Core/Services/IContentTypeSchemaService.cs	Defines the service interface with GetDocumentTypes() and GetMediaTypes() methods
src/Umbraco.Core/Services/ContentTypeSchemaService.cs	Implements the service by extracting schema information from content/media type services and published content type cache
src/Umbraco.Core/Models/ContentTypeSchemaInfo.cs	Model representing content type schema metadata including alias, schema ID, compositions, and properties
src/Umbraco.Core/Models/ContentTypePropertySchemaInfo.cs	Model representing property schema metadata including alias, editor type, delivery API CLR type, and inheritance status
src/Umbraco.Core/DependencyInjection/UmbracoBuilder.cs	Registers the new service implementation in the DI container

[AndyButland]

All looks good to me @lauraneto and tests out as expected. I just left a few comments for consideration, nothing major.