modernize: migrate to Leptos 0.8 and Server Functions architecture, break backend->shared loop

shared/src/lib.rs

@@ -1,6 +1,14 @@
 use serde::{Deserialize, Serialize};
 use utoipa::ToSchema;
 
+#[cfg(feature = "ssr")]
+pub mod scgi;
+
+#[cfg(feature = "ssr")]
+pub mod xmlrpc;
+
+pub mod server_fns;
+
 #[derive(Debug, Serialize, Deserialize, Clone, PartialEq, ToSchema)]
 pub struct Torrent {
     pub hash: String,
@@ -135,4 +143,4 @@ pub struct SetLabelRequest {
 pub struct AddTorrentRequest {
     #[schema(example = "magnet:?xt=urn:btih:...")]
     pub uri: String,
-}
+}