feat: replace Web Push with ntfy for medication reminders

Single notification path via ntfy HTTP publish for reliable Android delivery;
remove VAPID, push subscriptions, and SW push handlers. PWA settings show
topic subscribe link; humor texts and deep-link actions unchanged.

Co-authored-by: Cursor <cursoragent@cursor.com>

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, subscribePush } from "./lib/pwa.js";
+import { registerPwa, wirePwaInstall } 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();
   });
 
-  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.";
+  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;
     }
-  });
+  } catch {
+    document.getElementById("notifyTopic").textContent = "Notify-Config konnte nicht geladen werden.";
+  }
 
   await flushQueue((data) => api.log(data));
   await refreshDashboard();