Implement an offline-first download and installation process for apps.

[TimPietrusky]

User Story

Title: Seamless Offline App Download and Installation
As a Captain user
I want to queue AI applications for download when online and have them automatically downloaded and ready for installation, leveraging the locally stored marketplace data
So that I can install and use these applications seamlessly, even without an internet connection, while ensuring that the marketplace experience remains consistent and up-to-date with the manually or periodically updated app catalog data

Acceptance Criteria

• Users can select applications for download from the locally stored and periodically updated marketplace data when online.
• The offline installation process is integrated with offline-accessible documentation and support resources, ensuring users have all the information they need for a successful setup.

[TimPietrusky]

We don't want to do this as part of the Marketplace. What we want is to have the marketplace-data locally (see #102) and we want to install apps that exist locally (for example because someone is developing an app) via drag'n'drop (see #126).

Closing this issue as not needed.