Revert "feat: replace Web Push with ntfy for medication reminders"

This reverts commit 1cada42370.

public/app.js

@@ -2,7 +2,7 @@ import { api } from "./lib/api.js";
 import { getToken, setToken, clearToken, isLoggedIn } from "./lib/auth.js";
 import { setStreakBadge } from "./lib/badge.js";
 import { enqueue, flushQueue } from "./lib/offlineQueue.js";
-import { registerPwa, wirePwaInstall } from "./lib/pwa.js";
+import { registerPwa, wirePwaInstall, subscribePush } from "./lib/pwa.js";
 import { renderSlots, renderHeatmap, updateStats, showToast, showConfetti, showEasterEgg } from "./lib/ui.js";
 
 const STATUS = { upcoming: "Noch nicht", pending: "Jetzt!", overdue: "Überfällig", snoozed: "Snoozed", taken: "Genommen", missed: "Verpasst" };
@@ -153,20 +153,20 @@ async function initApp() {
     location.reload();
   });
 
-  try {
-    const notify = await api.notifyConfig();
-    const topicEl = document.getElementById("notifyTopic");
-    const linkEl = document.getElementById("notifySubscribeLink");
-    if (notify.configured && notify.subscribe_url) {
-      topicEl.textContent = `Topic: ${notify.topic}`;
-      linkEl.href = notify.subscribe_url;
-    } else {
-      topicEl.textContent = "ntfy nicht konfiguriert (NTFY_URL + NTFY_TOPIC in .env).";
-      linkEl.hidden = true;
+  document.getElementById("enablePush").addEventListener("click", async () => {
+    const statusEl = document.getElementById("pushStatus");
+    try {
+      const perm = await Notification.requestPermission();
+      if (perm !== "granted") { statusEl.textContent = "Permission verweigert."; return; }
+      const { key } = await api.vapidKey();
+      if (!key) { statusEl.textContent = "VAPID keys nicht konfiguriert."; return; }
+      const sub = await subscribePush(key);
+      await api.pushSubscribe(sub);
+      statusEl.textContent = "Push aktiv! Du wirst dezent erinnert.";
+    } catch (e) {
+      statusEl.textContent = e.message || "Push-Setup fehlgeschlagen.";
     }
-  } catch {
-    document.getElementById("notifyTopic").textContent = "Notify-Config konnte nicht geladen werden.";
-  }
+  });
 
   await flushQueue((data) => api.log(data));
   await refreshDashboard();