Refactor: Ja/Nein-Abfrage in gemeinsame Hilfsfunktion ausgelagert

prompt_target_user und prompt_ollama_models_path implementierten die
gleiche CLI-Ja/Nein-Abfrage (read + Trim + Regex-Prüfung) unabhängig
voneinander. Beide Kopien waren bereits leicht auseinandergelaufen
(unterschiedliches Fallback-Zeichen, unterschiedliche Regex-
Reihenfolge). confirm_yes_no() bündelt die Logik an einer Stelle.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017WMUd2fGsPCtTCVQkSS5TA

lib/utils.sh

@@ -135,6 +135,23 @@ run_whiptail() {
     fi
 }
 
+# Ask a yes/no question on the CLI. Returns 0 for yes, 1 for no.
+# On read failure (e.g. closed stdin), falls back to default_answer.
+# Usage: confirm_yes_no "<prompt>" "<y|n default answer>" "$tty_in" "$tty_out"
+confirm_yes_no() {
+    local prompt="$1"
+    local default_answer="$2"
+    local tty_in="$3"
+    local tty_out="$4"
+    local answer=""
+    read -r -p "$prompt" answer < "$tty_in" > "$tty_out" 2>&1 || answer="$default_answer"
+    answer="$(sed -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//' <<< "$answer")"
+    if [[ -z "$answer" ]]; then
+        answer="$default_answer"
+    fi
+    [[ "$answer" =~ ^[YyJj] ]]
+}
+
 # Determine and prompt for the non-root target user
 prompt_target_user() {
     if [[ -n "${TARGET_USER:-}" ]]; then
@@ -173,9 +190,7 @@ prompt_target_user() {
         if [[ -n "$candidate" && "$candidate" != "root" ]]; then
             printf "\n%bTarget User Detection:%b\n" "${CLR_CYAN}" "${CLR_RESET}" > "$tty_out"
             printf "Detected target user: %b%s%b\n" "${CLR_BOLD}" "$candidate" "${CLR_RESET}" > "$tty_out"
-            local answer=""
+            if confirm_yes_no "Use target user '$candidate'? [Y/n]: " "y" "$tty_in" "$tty_out"; then
-            read -r -p "Use target user '$candidate'? [Y/n]: " answer < "$tty_in" > "$tty_out" 2>&1 || answer="y"
-            if [[ -z "$answer" || "$answer" =~ ^[YyJj] ]]; then
                 chosen="$candidate"
             fi
         fi
@@ -296,10 +311,7 @@ prompt_ollama_models_path() {
         if [[ -z "$chosen" ]]; then
             printf "\n%bOllama KI-Modelle Speicherort:%b\n" "${CLR_CYAN}" "${CLR_RESET}" > "$tty_out"
             printf "Standard-Pfad: %b%s%b\n" "${CLR_BOLD}" "$default_path" "${CLR_RESET}" > "$tty_out"
-            local use_default=""
+            if confirm_yes_no "Standard-Speicherort verwenden? [J/n]: " "j" "$tty_in" "$tty_out"; then
-            read -r -p "Standard-Speicherort verwenden? [J/n]: " use_default < "$tty_in" > "$tty_out" 2>&1 || use_default="j"
-            use_default="$(echo "$use_default" | sed -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//')"
-            if [[ -z "$use_default" || "$use_default" =~ ^[JjYy] ]]; then
                 chosen="$default_path"
             else
                 local input_path=""