add support for Gotify push notifications

app/models/system/NotifyConfig.model.js

@@ -0,0 +1,42 @@
+const { Model } = require('flitter-orm')
+
+class NotifyConfigModel extends Model {
+    static get services() {
+        return [...super.services, 'notify', 'configs', 'jobs']
+    }
+
+    static get schema() {
+        return {
+            user_id: String,
+            gateway_url: String,
+            application_key: String,
+            created_on: { type: Date, default: () => new Date },
+            active: { type: Boolean, default: true },
+        }
+    }
+
+    async to_api() {
+        return {
+            user_id: this.user_id,
+            gateway_url: this.gateway_url,
+            application_key: this.application_key,
+            created_on: this.created_on,
+            active: this.active,
+        }
+    }
+
+    async send({ title = '', message, priority = 5 }) {
+        if ( !title ) title = this.configs.get('app.name')
+        this.notify.host = this.gateway_url
+        await this.notify.send_one(this.application_key, title, message, priority)
+        this.notify.host = false
+    }
+
+    async log({ title = '', message, priority = 5 }) {
+        await this.jobs.queue('notifications').add('PushNotify', {
+            title, message, priority, user_id: this.user_id,
+        })
+    }
+}
+
+module.exports = exports = NotifyConfigModel