Some questions that Guix maintainer may have interest in:

1. Why separate telega-server to a dedicated package?

emacs-build-system is quite cumbersome due to the different install step
than gnu-build-system, if we try to mix the build code of server into it
via 'modify-phases', it'll be very hard to read and understand the logic
of package code.

Move telega-server to a dedicated package can also help us separate
package, if there's a program uses telega-server, it doesn't have to add
emacs-telega as input, they just add emacs-telega-server.

2. Why propagated ffmpeg.

I check the source and found that telega use binaries from ffmpeg many
different place in telega-ffplay.el and telega-vvnote.el. So it's better
to propagated it because it's not easy to fix them all.

3. Why install resources to '<prefix>/share/emacs-telega'?

I think it is closer to the flavor of FHS, and it's not hard to achieve it.
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Zihao