fix(packages): use arrays for package commands, add dry-run, and support apk

[ashishsinghbora]

Summary

• Replaced word-split string commands with Bash arrays (${CMD[@]}) in install-package.sh and remove-package.sh to prevent execution failure on multi-argument commands like pacman -S --noconfirm.
• Added -n / --dry-run option across package manager utilities.
• Added Alpine Linux (apk) support across all scripts/packages/ scripts.
• Fixed package-info.sh pacman query to fall back to pacman -Si when package is not installed locally.
• Fixed environment variable shadowing of TERM in search-package.sh.

Verification

• Verified with unit tests mocking pacman, apt, dnf, zypper, and apk in an isolated PATH environment.
• Verified ShellCheck passes without warnings.
• Verified test suite passes.

[ashishsinghbora]

Code review: verified array execution prevents word splitting on package commands, added dry-run options, supported apk, and tested with mock binaries across 5 package managers.