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/01-app-demos/bluetooth-scanner/src/main.rs

@@ -0,0 +1,90 @@
+use dioxus::prelude::*;
+
+fn main() {
+    dioxus::launch(app)
+}
+
+fn app() -> Element {
+    let mut scan = use_action(|| async {
+        use btleplug::api::{Central, Manager as _, Peripheral, ScanFilter};
+
+        let manager = btleplug::platform::Manager::new().await?;
+
+        // get the first bluetooth adapter
+        let adapters = manager.adapters().await?;
+        let central = adapters
+            .into_iter()
+            .next()
+            .context("No Bluetooth adapter found")?;
+
+        // start scanning for devices
+        central.start_scan(ScanFilter::default()).await?;
+        tokio::time::sleep(std::time::Duration::from_secs(2)).await;
+
+        // Return the list of peripherals after scanning
+        let mut devices = vec![];
+        for p in central.peripherals().await? {
+            if let Some(p) = p.properties().await? {
+                devices.push(p);
+            }
+        }
+
+        // Sort them by RSSI (signal strength)
+        devices.sort_by_key(|p| p.rssi.unwrap_or(-100));
+
+        dioxus::Ok(devices)
+    });
+
+    rsx! {
+        Stylesheet { href: asset!("/assets/tailwind.css") }
+        div {
+            div { class: "py-8 px-6",
+                div { class: "container px-4 mx-auto",
+                    h2 { class: "text-2xl font-bold", "Scan for Bluetooth Devices" }
+                    button {
+                        class: "inline-block w-full md:w-auto px-6 py-3 font-medium text-white bg-indigo-500 hover:bg-indigo-600 rounded transition duration-200",
+                        disabled: scan.is_pending(),
+                        onclick: move |_| {
+                            scan.call();
+                        },
+                        if scan.is_pending() { "Scanning" } else { "Scan" }
+                    }
+                }
+            }
+
+            section { class: "py-8",
+                div { class: "container px-4 mx-auto",
+                    div { class: "p-4 mb-6 bg-white shadow rounded overflow-x-auto",
+                        table { class: "table-auto w-full",
+                            thead {
+                                tr { class: "text-xs text-gray-500 text-left",
+                                    th { class: "pl-6 pb-3 font-medium", "Strength" }
+                                    th { class: "pb-3 font-medium", "Network" }
+                                    th { class: "pb-3 font-medium", "Channel" }
+                                    th { class: "pb-3 px-2 font-medium", "Security" }
+                                }
+                            }
+                            match scan.result() {
+                                None if scan.is_pending() => rsx! { "Scanning..." },
+                                None => rsx! { "Press Scan to start scanning" },
+                                Some(Err(_err)) => rsx! { "Failed to scan" },
+                                Some(Ok(peripherals)) => rsx! {
+                                    tbody {
+                                        for peripheral in peripherals.read().iter().rev() {
+                                            tr { class: "text-xs bg-gray-50",
+                                                td { class: "py-5 px-6 font-medium", "{peripheral.rssi.unwrap_or(-100)}" }
+                                                td { class: "flex py-3 font-medium", "{peripheral.local_name.clone().unwrap_or_default()}" }
+                                                td { span { class: "inline-block py-1 px-2 text-white bg-green-500 rounded-full", "{peripheral.address}" } }
+                                                td {  span { class: "inline-block py-1 px-2 text-purple-500 bg-purple-50 rounded-full", "{peripheral.tx_power_level.unwrap_or_default()}" } }
+                                            }
+                                        }
+                                    }
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    }
+}