feat: Notifiers CRUD (#337)

* introduce scaffold for new models

* wip: shoutrrr wrapper (may remove)

* update schema files

* gen: ent code

* gen: migrations

* go mod tidy

* add group_id to notifier

* db migration

* new mapper helpers

* notifier repo

* introduce experimental adapter pattern for hdlrs

* refactor adapters to fit more common use cases

* new routes for notifiers

* update errors to fix validation panic

* go tidy

* reverse checkbox label display

* wip: notifiers UI

* use badges instead of text

* improve documentation

* add scaffold schema reference

* remove notifier service

* refactor schema folder

* support group edges via scaffold

* delete test file

* include link to API docs

* audit and update documentation + improve format

* refactor schema edges

* refactor

* add custom validator

* set validate + order fields by name

* fix failing tests

frontend/lib/api/classes/notifiers.ts

@@ -0,0 +1,28 @@
+import { BaseAPI, route } from "../base";
+import { NotifierCreate, NotifierOut, NotifierUpdate } from "../types/data-contracts";
+
+export class NotifiersAPI extends BaseAPI {
+  getAll() {
+    return this.http.get<NotifierOut[]>({ url: route("/notifiers") });
+  }
+
+  create(body: NotifierCreate) {
+    return this.http.post<NotifierCreate, NotifierOut>({ url: route("/notifiers"), body });
+  }
+
+  update(id: string, body: NotifierUpdate) {
+    if (body.url === "") {
+      body.url = null;
+    }
+
+    return this.http.put<NotifierUpdate, NotifierOut>({ url: route(`/notifiers/${id}`), body });
+  }
+
+  delete(id: string) {
+    return this.http.delete<void>({ url: route(`/notifiers/${id}`) });
+  }
+
+  test(url: string) {
+    return this.http.post<{ url: string }, null>({ url: route(`/notifiers/test`), body: { url } });
+  }
+}