feat(setup): replace hardcoded loadkeys with a KEYMAPS-array menu

Both the live-environment prompt and the installed-system prompt now
loop over a single KEYMAPS array, so adding a new layout is a
one-line change.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

setup/archbaseos-guided-install.sh

@@ -62,6 +62,36 @@ fi
 ############################################
 # Begin
 ############################################
+
+############################################
+# Keyboard layout (live environment)
+# To add more layouts: append "code|Display Name" to KEYMAPS
+############################################
+KEYMAPS=(
+    "us|English US"
+    "de|German"
+)
+
+if $AF_MODE; then
+    LIVE_KEYMAP=$(af_get '.keymap' 'us')
+else
+    echo "Select keyboard layout:"
+    for i in "${!KEYMAPS[@]}"; do
+        _km_code="${KEYMAPS[$i]%%|*}"
+        _km_name="${KEYMAPS[$i]##*|}"
+        printf "  %d) %-14s (%s)\n" $((i+1)) "$_km_name" "$_km_code"
+    done
+    read -rp "Choice [1]: " _KM_IDX
+    _KM_IDX=$(( ${_KM_IDX:-1} - 1 ))
+    if (( _KM_IDX >= 0 && _KM_IDX < ${#KEYMAPS[@]} )); then
+        LIVE_KEYMAP="${KEYMAPS[$_KM_IDX]%%|*}"
+    else
+        LIVE_KEYMAP="${KEYMAPS[0]%%|*}"
+    fi
+fi
+
+loadkeys "$LIVE_KEYMAP"
+
 lsblk
 
 if $AF_MODE && [[ -n "$(af_get '.drive')" ]]; then
@@ -141,14 +171,19 @@ else
     read -rp "Enable FIDO2 for user login? (YES/NO): " ENABLE_FIDO_USER
 
     echo ""
-    echo "Select keyboard layout:"
-    echo "  1) English US  (us)"
-    echo "  2) German      (de)"
+    echo "Select keyboard layout for installed system:"
+    for i in "${!KEYMAPS[@]}"; do
+        _km_code="${KEYMAPS[$i]%%|*}"
+        _km_name="${KEYMAPS[$i]##*|}"
+        printf "  %d) %-14s (%s)\n" $((i+1)) "$_km_name" "$_km_code"
+    done
     read -rp "Choice [1]: " _KM_CHOICE
-    case "${_KM_CHOICE:-1}" in
-        2) KEYMAP="de" ;;
-        *) KEYMAP="us" ;;
-    esac
+    _KM_CHOICE=$(( ${_KM_CHOICE:-1} - 1 ))
+    if (( _KM_CHOICE >= 0 && _KM_CHOICE < ${#KEYMAPS[@]} )); then
+        KEYMAP="${KEYMAPS[$_KM_CHOICE]%%|*}"
+    else
+        KEYMAP="${KEYMAPS[0]%%|*}"
+    fi
 fi
 
 read -rsp "Password for $USERNAME: " USERPASS; echo