fix: persist install subscription only after successful config generation

Author: wnlen

install.sh

@@ -41,6 +41,9 @@ prompt_subscription_if_needed
 
 if [ -n "$(subscription_url 2>/dev/null || true)" ]; then
   if generate_config; then
+    if [ -n "${INSTALL_PENDING_SUBSCRIPTION_URL:-}" ]; then
+      write_env_value "CLASH_SUBSCRIPTION_URL" "$INSTALL_PENDING_SUBSCRIPTION_URL"
+    fi
     echo "✨ 订阅已生效"
     post_install_verify
   else

scripts/core/config.sh

@@ -2816,7 +2816,7 @@ prompt_subscription_if_needed() {
   fi
 
   input_fmt="$(detect_subscription_format "$input_url")"
-  write_env_value "CLASH_SUBSCRIPTION_URL" "$input_url"
+  INSTALL_PENDING_SUBSCRIPTION_URL="$input_url"
   bootstrap_subscription_from_install_input "$input_url" "$input_fmt" "default"
 }