fix(installer): derive the wireless regdom by pattern and retire two inert hooks

The regulatory domain came from a fixed offset, "${current_lang:3:2}", which is right only for a two-letter language code. validate_config accepts three-letter languages and glibc ships 75 of them, so ber_DZ.UTF-8 yielded "_D" and C yielded "". A garbage region matches no line in the regdom file, sed exits 0, and the || error_warn could never fire, so WiFi sat on the conservative "00" domain in silence.

locale_country matches the _CC group instead of counting characters, and set_wireless_regdom verifies the substitution actually landed. That second half is the part worth keeping: every sed -i in this installer shares the stance that a no-match is indistinguishable from success, and this is the one where the silence costs something.

switch_udev_hook_to_systemd now rewrites keymap and consolefont to sd-vconsole when it performs the swap. Both are busybox-only run_hook scripts, so a systemd initramfs installs them and never runs them, and this machine's own HOOKS line carries all three today. Cosmetic on a box that just boots, and not cosmetic on one asking for a passphrase with a non-US layout, which is exactly what sd-vconsole restores. The two collapse into one entry and an existing sd-vconsole is not duplicated.

Before building it I answered the question the task left open. This machine is KEYMAP=us with no encrypt hook, so no prompt, but the function runs on LUKS machines where there is one, and sd-vconsole ships with mkinitcpio.

364 unit tests, exit 0. Adds tests/installer-steps/test_wireless_regdom.py (16) and 7 sd-vconsole cases. Every guard proven by deleting it, including one whose first version passed with the guard gone because a later check caught the same case.

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