codify "platform" into resolution logic, server-fn/fullstack overhaul (#4596)

overhaul dioxus fullstack using a new implementation of server_fn

This PR is a complete rewrite of dioxus fullstack designed to improve compatibility with axum and to fix a number of compilation errors based on feature flag unification plumbing through macros.

packages/cli-config/src/lib.rs

@@ -222,6 +222,7 @@ pub fn is_cli_enabled() -> bool {
 /// be served at `http://localhost:8080/dogapp`.
 ///
 /// All assets will be served from this base path as well, ie `http://localhost:8080/dogapp/assets/logo.png`.
+#[allow(unreachable_code)]
 pub fn base_path() -> Option<String> {
     // This may trigger when compiling to the server if you depend on another crate that pulls in
     // the web feature. It might be better for the renderers to provide the current platform