Add self-hosted ntfy deployment for ntfy.schwenk.online.

Docker Compose with Traefik routing, auth-enabled server config, and local cache volume.

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

config/server.yml

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+# ntfy.schwenk.online — personal push server (TLS terminated by Traefik)
+
+base-url: "https://ntfy.schwenk.online"
+listen-http: ":80"
+behind-proxy: true
+
+# Message cache (survives restarts, supports since= polling)
+cache-file: "/var/cache/ntfy/cache.db"
+cache-duration: "12h"
+cache-startup-queries: |
+  pragma journal_mode = WAL;
+  pragma synchronous = normal;
+  pragma temp_store = memory;
+  pragma busy_timeout = 15000;
+
+# Access control — create your first admin user after start:
+#   docker exec -it ntfy.schwenk.online ntfy user add frank --role=admin
+auth-file: "/var/cache/ntfy/auth.db"
+auth-default-access: "deny-all"
+enable-login: true
+require-login: true
+enable-signup: false
+
+# Attachments (e.g. Grafana alerts, backup reports)
+attachment-cache-dir: "/var/cache/ntfy/attachments"
+attachment-total-size-limit: "500M"
+attachment-file-size-limit: "5M"
+attachment-expiry-duration: "24h"
+
+# iOS app: uses ntfy.sh only for poll_request signaling; message content stays here
+upstream-base-url: "https://ntfy.sh"
+
+keepalive-interval: "45s"