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/shared/providers/websocket.provider.dart

@@ -58,14 +58,15 @@ class WebsocketNotifier extends StateNotifier<WebsocketState> {
 
     if (authenticationState.isAuthenticated) {
       var accessToken = Hive.box(userInfoBox).get(accessTokenKey);
-      var endpoint = Hive.box(userInfoBox).get(serverEndpointKey);
       try {
+        var endpoint = Uri.parse(Hive.box(userInfoBox).get(serverEndpointKey));
+
         debugPrint("Attempting to connect to websocket");
         // Configure socket transports must be specified
         Socket socket = io(
-          endpoint.toString().replaceAll('/api', ''),
+          endpoint.origin,
           OptionBuilder()
-              .setPath('/api/socket.io')
+              .setPath("${endpoint.path}/socket.io")
               .setTransports(['websocket'])
               .enableReconnection()
               .enableForceNew()