chore: fix prompt input/output redirection to prevent interference with piped commands

Redirect all prompt output to stderr and read input directly from /dev/tty to ensure prompts work correctly when the script is piped or redirected.

setup.sh

@@ -87,25 +87,26 @@ prompt() {
     fi
 
     if [ "$is_secret" = true ]; then
-        echo -ne "${YELLOW}${prompt_text}: ${NC}"
+        echo -ne "${YELLOW}${prompt_text}: ${NC}" >&2
         value=""
-        while IFS= read -r -s -n1 char; do
+        while IFS= read -r -s -n1 char < /dev/tty; do
             if [[ $char == $'\0' ]]; then
                 break
             fi
             if [[ $char == $'\177' ]] || [[ $char == $'\b' ]]; then
                 if [ ${#value} -gt 0 ]; then
                     value="${value%?}"
-                    echo -ne "\b \b"
+                    echo -ne "\b \b" >&2
                 fi
             else
                 value+="$char"
-                echo -n "*"
+                echo -n "*" >&2
             fi
         done
-        echo ""
+        echo "" >&2
     else
-        read -p "$(echo -e ${YELLOW}${prompt_text}: ${NC})" value
+        echo -ne "${YELLOW}${prompt_text}: ${NC}" >&2
+        read value < /dev/tty
     fi
 
     if [ -z "$value" ] && [ -n "$default_value" ]; then