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>

server/app.py

@@ -16,7 +16,6 @@ from server.auth import create_token, require_auth, verify_pin
 from server.config_loader import load_meds_config, slot_to_dict, today_str
 from server.db import ensure_schema, get_db, new_id, utc_now_iso
 from server.messages import pick
-from server.push import save_subscription, send_slot_reminder
 from server.scheduler import schedule_snooze, start_scheduler
 from server.settings import settings
 from server.slots import build_today
@@ -73,9 +72,18 @@ async def auth_pin(payload: dict[str, Any]) -> JSONResponse:
     return JSONResponse({"token": create_token()}, headers=NO_STORE)
 
 
-@app.get("/api/vapid-public-key")
-async def vapid_public_key() -> JSONResponse:
-    return JSONResponse({"key": settings.vapid_public_key}, headers=NO_STORE)
+@app.get("/api/notify-config")
+async def notify_config(_: dict = Depends(require_auth)) -> JSONResponse:
+    base = settings.ntfy_url.rstrip("/") if settings.ntfy_url else ""
+    topic = settings.ntfy_topic
+    return JSONResponse(
+        {
+            "topic": topic,
+            "subscribe_url": f"{base}/{topic}" if base and topic else "",
+            "configured": bool(base and topic),
+        },
+        headers=NO_STORE,
+    )
 
 
 @app.get("/api/config")
@@ -166,19 +174,6 @@ async def get_stats(_: dict = Depends(require_auth)) -> JSONResponse:
     return JSONResponse(stats, headers=NO_STORE)
 
 
-@app.post("/api/push/subscribe")
-async def push_subscribe(payload: dict[str, Any], _: dict = Depends(require_auth)) -> JSONResponse:
-    sub = payload.get("subscription")
-    if not sub or not sub.get("endpoint"):
-        raise HTTPException(status_code=400, detail="Invalid subscription")
-    db = await get_db()
-    try:
-        await save_subscription(db, sub)
-    finally:
-        await db.close()
-    return JSONResponse({"ok": True}, headers=NO_STORE)
-
-
 @app.post("/api/snooze")
 async def post_snooze(payload: dict[str, Any], _: dict = Depends(require_auth)) -> JSONResponse:
     slot_id = str(payload.get("slot_id", ""))