Fixes & improvements to Jellyseer integration (#783)

## Description
Fixes several bugs and makes it easier to log in to a Jellyseer instance

- Fix initial focus & next focus on the add server dialog
- Don't use an API key for non-API key auth (credit to @voc0der in #734
for suggesting this)
- Show trailers for TV shows
- Fix incorrect/missing similar and recommended rows for both movies &
TV shows
- Allow empty password for Jellyfin users without a password

Log in will now try variations of the input URL such as add the protocol
and/or default port. This is similar to the regular Jellyfin login
process.

### Related issues
Fixes #778
Fixes #750
Fixes #740
Might help with #747
Fixes
https://github.com/damontecres/Wholphin/issues/764#issuecomment-3801324648

app/src/main/seerr/seerr-api.yml

@@ -897,8 +897,6 @@ components:
             - Bloopers
         site:
           type: string
-          enum:
-            - 'YouTube'
     MovieDetails:
       type: object
       properties:
@@ -1226,6 +1224,10 @@ components:
           type: array
           items:
             $ref: '#/components/schemas/WatchProviders'
+        relatedVideos:
+          type: array
+          items:
+            $ref: '#/components/schemas/RelatedVideo'
     MediaRequest:
       type: object
       properties: