feat(.well-known): add .well-known/immich to reference API endpoint (#1308)

* feat(.well-known): add .well-known/immich to reference API endpoint

* feat(.well-known): make schema optional (defaults to https)

* adjust method comment to be a little less confusing

* fix casting issue with resovled url

* include when checking Well-known, update server hint

* add validation for login form's server url

* consolidate common process into resolveAndSetEndpoint

* fix missed prettier formatting

* revert translation changes

* update environment variable description, hopefully a bit clearer

* rename environment variable to IMMICH_API_URL_EXTERNAL

* comment out optional env variables

* fix(web): browser-side api client to include authorization token

* Revert "fix(web): browser-side api client to include authorization token"

This reverts commit 60e338938f.

* remove multi-domain related changes

mobile/lib/utils/url_helper.dart

@@ -0,0 +1,8 @@
+String sanitizeUrl(String url) {
+  // Add schema if none is set
+  final urlWithSchema =
+      url.startsWith(RegExp(r"https?://")) ? url : "https://$url";
+
+  // Remove trailing slash(es)
+  return urlWithSchema.replaceFirst(RegExp(r"/+$"), "");
+}