fix: add offline Prisma build support for OBS/RPM builds

[whocoder11]

adding offline Prisma build support for OBS/RPM builds

• Add pre-downloaded Prisma engine binaries in prisma-engines/
• Add scripts/install-prisma-engines.sh to install engines offline
• Add build:backend:offline and build:all:offline npm scripts

Fixes #56

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🔨 Latest commit	cea1ab0

[lkocman]

We probably need to build the engines ourselves.

[lkocman]

I will look into this, otherwise we do have bundled prisma engine in rpm https://build.opensuse.org/package/show/home:lkocman:kudos/kudos
https://build.opensuse.org/project/show/openSUSE:infrastructure:kudos

[whocoder11]

Hi @lkocman, Thanks for the context! I see that you've already handled this in the RPM spec by bundling the engine as a separate source. Should I close this PR, or would it still be useful to keep the install-prisma-engines.sh script as a convenience for developers who want to do offline builds outside of OBS? Happy to adapt the approach to match what you need.