Add ntfy push notifications with action buttons for meal reminders

- ntfy.py: send_meal_reminder() with Home/Out HTTP action buttons, test helper
- models.py: new columns ntfy_url, ntfy_token, callback_token on users table
- meals.py: /api/ntfy-callback (public, token-authenticated), /ntfy-settings, /ntfy-test
- app.py: flask send-reminders CLI command (cron-schedulable)
- Dashboard: ntfy config form in Account Settings
- i18n: translations for all ntfy strings (en/fr/de)
- Dockerfile: include ntfy.py in COPY
- tests: 15 new tests covering callback, settings, and auth
- docs: updated AGENTS.md and doc/index.md

templates/dashboard.html

@@ -96,6 +96,23 @@
                 <button class="btn btn-danger">{{ t('Delete My Account') }}</button>
             </form>
 
+            <form method="POST" action="{{ url_for('meals.ntfy_settings') }}" class="manage-form">
+                <h4>🔔 {{ t('Ntfy Notifications') }}</h4>
+                <p class="hint">{{ t('Get meal reminders on your phone via ntfy.') }}</p>
+                <label for="ntfy_url">{{ t('Ntfy Topic URL') }}</label>
+                <input type="text" id="ntfy_url" name="ntfy_url"
+                       placeholder="https://ntfy.sh/your-topic"
+                       value="{{ ntfy.ntfy_url or '' }}">
+                <label for="ntfy_token">{{ t('Access Token') }} <span class="hint">{{ t('(optional)') }}</span></label>
+                <input type="password" id="ntfy_token" name="ntfy_token"
+                       placeholder="tk_..."
+                       value="{{ ntfy.ntfy_token or '' }}">
+                <div class="btn-row" style="margin-top: 8px;">
+                    <button type="submit" class="btn btn-primary btn-sm">{{ t('Save') }}</button>
+                    <button type="submit" class="btn btn-sm" formaction="{{ url_for('meals.ntfy_test') }}">{{ t('Send Test') }}</button>
+                </div>
+            </form>
+
             {% if is_admin %}
             <form method="POST" action="{{ url_for('meals.admin_delete_household') }}"
                   onsubmit="return confirm(this.dataset.confirmMsg);"