[codex] Fix openSUSE RPM install

[ilysenko]

Summary

• replace Fedora-specific RPM desktop library package names with shared-library capabilities so openSUSE can resolve them
• make the RPM library capability suffix architecture-aware instead of hardcoding 64-bit for every target
• normalize staged native package payload permissions so private local build dirs do not ship as unreadable /opt trees

Validation

• git diff --check
• bash -n scripts/build-deb.sh scripts/build-rpm.sh scripts/build-pacman.sh scripts/lib/package-common.sh tests/scripts_smoke.sh
• rpmspec --target x86_64 -P rendered spec
• rpmspec --target armv7hl -P rendered spec
• rpmbuild -bb rendered no-updater spec with a minimal staging tree
• bash tests/scripts_smoke.sh

Fixes #292