Chia-Network / chia-blockchain / 25120389798

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Fix DEB and RPM package compression for smaller installer sizes (#20689)

* Fix DEB and RPM package compression for smaller installer sizes

DEB packages were using poor compression defaults: the GUI DEB used
electron-builder's 7-Zip xz with a 4 MiB dictionary, and the CLI DEB
used the build host's default zstd level 3. Both RPMs lacked explicit
single-threaded xz settings. All four packages now use xz level 6
(64 MiB dictionary) for consistent, well-compressed output.

Made-with: Cursor

* Bump compression level to 9 for 64 MiB xz dictionary

Level 6 only gives an 8 MiB dictionary. Level 9 gives 64 MiB,
matching the compression ratio seen in the existing GUI RPM.

Made-with: Cursor

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