Load additional installed apps from server

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Is your feature request related to a problem? Please describe.

Many important parts of an application are server apps:

• Viewer and viewer extensions - #1899
• Smart picker integrations
• GitHub integrations
• User status modal
• Etc.

Describe the solution you'd like

Current idea is to add special build for apps to make them installable as a library and then download them from the server after login on demand.

Describe alternatives you've considered

?

Additional context

While it is fine to add spreed as a linked repo, we don't want to link every app. For optional apps like smart picker integrations it is not possible in general and should depend on server's installed apps.

The issue names no files, tests, or entry points. Start by mapping how the desktop client discovers and loads apps after login, then determine how server-installed optional apps should be identified and downloaded. Done means apps such as smart picker integrations can be installed on demand without linking every app as a separate repository.