[AI Bundle] Add `albert` platform configuration support

[jvancoillie]

The underlying support for the Albert API already exists in the codebase, but it is currently not possible to configure it through the ai.platforms section, as the albert platform name is not included in the list of auto-configured platforms (see AiBundle::processPlatformConfig).

Example configuration that should ideally work:

ai:
  platforms:
    albert:
      api_key: '%env(ALBERT_API_KEY)%'
      host_url: '%env(ALBERT_API_URL)%'

Expected behavior:
The configuration should register the Albert platform similarly to the existing platforms (e.g., openai, mistral, ollama, etc.).

Request:
Add "albert" to the list of recognized platform keys in the bundle so it can be configured normally.

Thanks!

[OskarStark]

Makes sense, PR welcome