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.

examples/08-apis/shortcut.rs

@@ -0,0 +1,25 @@
+//! Add global shortcuts to your app while a component is active
+//!
+//! This demo shows how to add a global shortcut to your app that toggles a signal. You could use this to implement
+//! a raycast-type app, or to add a global shortcut to your app that toggles a component on and off.
+//!
+//! These are *global* shortcuts, so they will work even if your app is not in focus.
+
+use dioxus::desktop::{HotKeyState, use_global_shortcut};
+use dioxus::prelude::*;
+
+fn main() {
+    dioxus::LaunchBuilder::desktop().launch(app);
+}
+
+fn app() -> Element {
+    let mut toggled = use_signal(|| false);
+
+    _ = use_global_shortcut("ctrl+s", move |state| {
+        if state == HotKeyState::Pressed {
+            toggled.toggle();
+        }
+    });
+
+    rsx!("toggle: {toggled}")
+}