feat(auth): misc fediverse auth improvements

- remove automatic app validation
- add force refresh option to GetFediverseUrlAsync
- pass state to mastodon authorization URI

Foxnouns.Backend/Database/Migrations/DatabaseContextModelSnapshot.cs

@@ -107,10 +107,6 @@ namespace Foxnouns.Backend.Database.Migrations
                         .HasColumnType("bigint")
                         .HasColumnName("id");
 
-                    b.Property<string>("AccessToken")
-                        .HasColumnType("text")
-                        .HasColumnName("access_token");
-
                     b.Property<string>("ClientId")
                         .IsRequired()
                         .HasColumnType("text")
@@ -130,10 +126,6 @@ namespace Foxnouns.Backend.Database.Migrations
                         .HasColumnType("integer")
                         .HasColumnName("instance_type");
 
-                    b.Property<Instant?>("TokenValidUntil")
-                        .HasColumnType("timestamp with time zone")
-                        .HasColumnName("token_valid_until");
-
                     b.HasKey("Id")
                         .HasName("pk_fediverse_applications");