Enhancement: support photoprism app passwords (gethomepage#4028)

docs/widgets/services/photoprism.md

@@ -3,14 +3,17 @@ title: PhotoPrism
 description: PhotoPrism Widget Configuration
 ---
 
-Learn more about [PhotoPrism](https://github.com/photoprism/photoprism)..
+Learn more about [PhotoPrism](https://github.com/photoprism/photoprism).
+
+Authentication is possible via [app passwords](https://docs.photoprism.app/user-guide/settings/account/#apps-and-devices) or username/password.
 
 Allowed fields: `["albums", "photos", "videos", "people"]`.
 
 ```yaml
 widget:
   type: photoprism
   url: http://photoprism.host.or.ip:port
-  username: admin
-  password: password
+  username: admin # required only if using username/password
+  password: password # required only if using username/password
+  key: # required only if using app passwords
 ```

src/widgets/photoprism/proxy.js

@@ -32,6 +32,11 @@ export default async function photoprismProxyHandler(req, res) {
       username: widget.username,
       password: widget.password,
     });
+  } else if (widget.key) {
+    params.headers.Authorization = `Bearer ${widget.key}`;
+    params.body = JSON.stringify({
+      authToken: widget.key,
+    });
   }
 
   const [status, contentType, data] = await httpProxy(url, params);