Improve support for semi-jailbreaks and add a flag to skip decrypting .appex

[ZomkaDEV]

Summary

1. Added a --skip-appex flag to skip decrypting app extensions, as they often do not get decrypted anyways (from my experience at least)
2. Modified the helper to bundle it into a .deb package, modified entitlements, and made some other changes to get it to work under nathanlr. (Fixes helper didn't respond with usage (got "") #20)

AI usage disclosure:

This PR was made largely with the help of Codex (GPT-5.5) as I kept getting stuck and not being able to find solutions on StackOverflow.

[ZomkaDEV]

Some info to keep in mind:

• The only device I tested this with is an iPad Air M1 running iOS 17.0 with nathanlr. I have no idea how it may work with Dopamine or palera1n as I don’t have any devices compatible with it.
• Decrypting appex and some frameworks seemed to not work. Whether that is an issue caused by my changes or it simply doesn’t work with semi-jailbreaks like nathanlr. (I tested decrypting Spotify and Instagram)

[ZomkaDEV]

• Decrypting appex and some frameworks seemed to not work. Whether that is an issue caused by my changes or it simply doesn’t work with semi-jailbreaks like nathanlr. (I tested decrypting Spotify and Instagram)

I was able to determine that it does happen even on the main branch, therefore my changes haven't influenced this. Looking forward to receiving feedback :)

[londek]

--skip-appex is now on main branch, could you attempt to apply your changes to 0.7.0 and let me know whether decryption has improved on ipads?