Refactor settings menu, add Nostr settings

Adds a setting to control if photos should be uploaded only to the
main/default server, or all known servers of a user.

Only upload to the main server by default, to speed up adding photos.

app/components/app-menu/settings/apis.gjs

@@ -0,0 +1,69 @@
+import Component from '@glimmer/component';
+import { on } from '@ember/modifier';
+import { service } from '@ember/service';
+import { action } from '@ember/object';
+import Icon from '#components/icon';
+import eq from 'ember-truth-helpers/helpers/eq';
+
+export default class AppMenuSettingsApis extends Component {
+  @service settings;
+
+  @action
+  updateApi(event) {
+    this.settings.updateOverpassApi(event.target.value);
+  }
+
+  @action
+  updatePhotonApi(event) {
+    this.settings.updatePhotonApi(event.target.value);
+  }
+
+  <template>
+    {{! template-lint-disable no-nested-interactive }}
+    <details>
+      <summary>
+        <Icon @name="server" @size={{20}} />
+        <span>API Providers</span>
+      </summary>
+      <div class="details-content">
+        <div class="form-group">
+          <label for="overpass-api">Overpass API Provider</label>
+          <select
+            id="overpass-api"
+            class="form-control"
+            {{on "change" this.updateApi}}
+          >
+            {{#each this.settings.overpassApis as |api|}}
+              <option
+                value={{api.url}}
+                selected={{if
+                  (eq api.url this.settings.overpassApi)
+                  "selected"
+                }}
+              >
+                {{api.name}}
+              </option>
+            {{/each}}
+          </select>
+        </div>
+        <div class="form-group">
+          <label for="photon-api">Photon API Provider</label>
+          <select
+            id="photon-api"
+            class="form-control"
+            {{on "change" this.updatePhotonApi}}
+          >
+            {{#each this.settings.photonApis as |api|}}
+              <option
+                value={{api.url}}
+                selected={{if (eq api.url this.settings.photonApi) "selected"}}
+              >
+                {{api.name}}
+              </option>
+            {{/each}}
+          </select>
+        </div>
+      </div>
+    </details>
+  </template>
+}