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/window_zoom.rs

@@ -0,0 +1,28 @@
+//! Adjust the zoom of a desktop app
+//!
+//! This example shows how to adjust the zoom of a desktop app using the webview.zoom method.
+
+use dioxus::prelude::*;
+
+fn main() {
+    dioxus::LaunchBuilder::desktop().launch(app);
+}
+
+fn app() -> Element {
+    let mut level = use_signal(|| 1.0);
+
+    rsx! {
+        h1 { "Zoom level: {level}" }
+        p { "Change the zoom level of the webview by typing a number in the input below." }
+        input {
+            r#type: "number",
+            value: "{level}",
+            oninput: move |e| {
+                if let Ok(new_zoom) = e.value().parse::<f64>() {
+                    level.set(new_zoom);
+                    _ = dioxus::desktop::window().webview.zoom(new_zoom);
+                }
+            }
+        }
+    }
+}