feat(mobile): auto api endpoint

[realashleybailey]

Code Addition: Automatically Adjust serverUrl with /api

This code addition ensures that the serverUrl string is correctly formatted to include /api at the end if it is missing, or remove any extra trailing slashes if the URL already ends with /api/.

Explanation

• Trimming Whitespace:
  The serverUrl is trimmed of any leading or trailing whitespace using serverUrl.trim(). This ensures there are no accidental spaces that could cause issues when checking or modifying the URL.

• Handling /api/ and /api:
  The logic checks if the serverUrl ends with /api/. If it does, the trailing slash is removed to standardize the URL format.

  If the serverUrl does not end with /api, the code appends /api to the URL. This ensures that the URL always contains /api at the end when needed.

Example Workflow

1. If serverUrl = "http://example.com/api/", it will be trimmed to http://example.com/api.
2. If serverUrl = "http://example.com", it will be changed to http://example.com/api.
3. If serverUrl = "http://example.com/api", it will remain unchanged.

This addition helps prevent issues with inconsistent server URLs by ensuring they always contain the proper /api endpoint suffix. Additionally this alleviates confusion when inviting friends/family to use your Immich server and you wish to just share your server URL without the /api at the end.

[github-actions]

Label error. Requires exactly 1 of: changelog:.*. Found: 📱mobile. A maintainer will add the required label.

[bo0tzz]

Ideally the input field just doesn't accept whitespace to begin with

[bo0tzz]

There's some .well-known endpoint autodiscovery code that already appends /api as one of the discovery steps, in https://github.com/immich-app/immich/blob/main/mobile/lib/services/api.service.dart.