fix(installer): show password input in plain text

Remove -s flag from read so the password is visible while typing,
enabling piped input to work visibly on the ISO installer.

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

setup/arch-autoinstall.sh

@@ -190,7 +190,7 @@ else
 fi
 
 # Password always prompted — never stored in answerfile
-read -rsp "Enter password for $USERNAME: " USERPASS; echo
+read -rp "Enter password for $USERNAME: " USERPASS
 [[ -z "$USERPASS" ]] && { echo "Error: password cannot be empty."; exit 1; }
 
 if ! $AF_MODE; then

setup/archbaseos-guided-install.sh

@@ -174,7 +174,7 @@ else
     fi
 fi
 
-read -rsp "Password for $USERNAME: " USERPASS; echo
+read -rp "Password for $USERNAME: " USERPASS
 [[ -z "$USERPASS" ]] && { echo "Error: password cannot be empty."; exit 1; }
 
 lsblk