fix(kontakt): replace simulated form submit with mailto: link

- Generate mailto: link with all form data on submit
- Opens user's email client with pre-filled email to mki@kies-media.de
- Subject includes interest type, body contains all form fields
- Update success message to reflect email client behavior
- Remove fake setTimeout simulation

Fix #15

js/haus-schleusingen.js

@@ -71,14 +71,33 @@ $(function () {
     }
   });
 
-  // Form submit
+  // Form submit – opens email client with pre-filled mailto: link
   $("#contactForm").on("submit", function (e) {
     e.preventDefault();
-    var btn = $(this).find(".btn-submit");
-    btn.text("Wird gesendet...").prop("disabled", true);
-    setTimeout(function () {
-      $("#contactForm").hide();
-      $("#formSuccess").fadeIn(400);
-    }, 1200);
+
+    var fname = $("#fname").val().trim();
+    var lname = $("#lname").val().trim();
+    var email = $("#email").val().trim();
+    var phone = $("#phone").val().trim();
+    var interest = $("#interest").val();
+    var message = $("#message").val().trim();
+
+    var subject = "Kontaktanfrage: " + interest;
+    var body = "Von: " + fname + " " + lname + "\n";
+    body += "E-Mail: " + email + "\n";
+    if (phone) body += "Telefon: " + phone + "\n";
+    body += "Anliegen: " + interest + "\n\n";
+    body += message;
+
+    var mailto =
+      "mailto:mki@kies-media.de" +
+      "?subject=" + encodeURIComponent(subject) +
+      "&body=" + encodeURIComponent(body);
+
+    window.location.href = mailto;
+
+    // Show success message
+    $("#contactForm").hide();
+    $("#formSuccess").fadeIn(400);
   });
 });