feat: add Go microservice, Dockerfile, docker-compose, and API submission endpoint

public/checkout.js

@@ -0,0 +1,100 @@
+// Checkout & Bestätigungsseite
+
+(function () {
+  const backLink = document.getElementById("backLink");
+  const summarySection = document.getElementById("summarySection");
+  const confirmationSection = document.getElementById("confirmationSection");
+  const summaryActivity = document.getElementById("summaryActivity");
+  const summaryDate = document.getElementById("summaryDate");
+  const summaryName = document.getElementById("summaryName");
+  const activityIcon = document.getElementById("activityIcon");
+  const checkoutBtn = document.getElementById("checkoutBtn");
+
+  const selectedActivity = localStorage.getItem("selectedActivity");
+  const selectedDate = localStorage.getItem("selectedDate");
+  const selectedName = localStorage.getItem("selectedName");
+
+  if (!selectedActivity || !selectedDate || !selectedName) {
+    window.location.href = "index.html";
+    return;
+  }
+
+  summaryActivity.textContent = selectedActivity;
+  summaryName.textContent = selectedName;
+
+  const dateObj = new Date(`${selectedDate}T00:00:00`);
+  const formattedDate = dateObj.toLocaleDateString("de-DE", {
+    weekday: "long",
+    day: "numeric",
+    month: "long",
+    year: "numeric",
+  });
+  summaryDate.textContent = formattedDate;
+
+  // Icons aus selectedActivities oder appsettings.json laden
+  let storedActivities = [];
+  try {
+    storedActivities = JSON.parse(localStorage.getItem("selectedActivities") || "[]");
+  } catch (e) {}
+
+  if (storedActivities.length > 0) {
+    activityIcon.textContent = storedActivities.map((a) => a.icon).join(" ");
+  } else {
+    fetch("appsettings.json")
+      .then((res) => res.json())
+      .then((settings) => {
+        const match = (settings.activities || []).find((a) => a.name === selectedActivity);
+        if (match && match.icon) {
+          activityIcon.textContent = match.icon;
+        }
+      })
+      .catch(() => {});
+  }
+
+  checkoutBtn.addEventListener("click", () => {
+    checkoutBtn.disabled = true;
+    const originalText = checkoutBtn.textContent;
+    checkoutBtn.textContent = "Wird übermittelt... 💌";
+
+    const payload = {
+      activity: selectedActivity,
+      activities: storedActivities,
+      date: selectedDate,
+      dateType: localStorage.getItem("selectedDateType") || "long",
+      name: selectedName,
+    };
+
+    fetch("/api/submit", {
+      method: "POST",
+      headers: {
+        "Content-Type": "application/json",
+      },
+      body: JSON.stringify(payload),
+    })
+      .then((res) => {
+        if (!res.ok) {
+          throw new Error("Fehler beim Übermitteln.");
+        }
+        return res.json();
+      })
+      .then((data) => {
+        if (data.success) {
+          summarySection.classList.add("hidden");
+          if (backLink) {
+            backLink.classList.add("hidden");
+          }
+          confirmationSection.classList.remove("hidden");
+        } else {
+          alert(data.message || "Es gab ein Problem bei der Übermittlung.");
+          checkoutBtn.disabled = false;
+          checkoutBtn.textContent = originalText;
+        }
+      })
+      .catch((err) => {
+        console.error("Submission error:", err);
+        alert("Übermittlung fehlgeschlagen. Bitte versuche es erneut.");
+        checkoutBtn.disabled = false;
+        checkoutBtn.textContent = originalText;
+      });
+  });
+})();