fix: deny access for bot creating a server (#238)

crates/delta/src/routes/servers/server_create.rs

@@ -44,6 +44,10 @@ pub async fn req(
     user: User,
     info: Json<DataCreateServer>,
 ) -> Result<Json<CreateServerResponse>> {
+    if user.bot.is_some() {
+        return Err(Error::IsBot);
+    }
+
     let info = info.into_inner();
     info.validate()
         .map_err(|error| Error::FailedValidation { error })?;