fix(just): honor IgnorePkg in pkg-apply / pkg-fix

Pacman's IgnorePkg only applies to -Sy{u} upgrade operations; explicit
`paru -S <pkg>` bypasses it entirely. `pkg-apply` and `pkg-fix` both
pipe the meta/*.txt package lists into `paru -S --needed`, so every
sync was reinstalling AUR pins (most painfully llama-cpp-vulkan, a
1-2h rebuild on every llama.cpp commit) whenever the AUR had a newer
version, defeating the whole point of pinning.

Parse IgnorePkg out of /etc/pacman.conf and strip those names from the
list before piping to paru. `pkg-add` is intentionally left
unfiltered: explicitly naming a package on the CLI is a deliberate
opt-in that should still work for pinned entries.

`pkg-update` (which is plain `paru -Syu`) already honors IgnorePkg
via pacman itself — no change needed there.

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