Re-export the axum feature flag under "server" (#2786)

* re-export the axum feature flag under "server"
* remove the axum prefix from all the fullstack examples

packages/fullstack/examples/hello-world/.gitignore

@@ -0,0 +1,4 @@
+dist
+target
+static
+.dioxus

packages/fullstack/examples/hello-world/Cargo.toml

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+[package]
+name = "fullstack-hello-world-example"
+version = "0.1.0"
+edition = "2021"
+publish = false
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+dioxus = { workspace = true, features = ["fullstack"]}
+serde = "1.0.159"
+simple_logger = "4.2.0"
+tracing-wasm = "0.2.1"
+tracing = { workspace = true }
+tracing-subscriber = "0.3.17"
+reqwest = { workspace = true }
+
+[features]
+default = []
+server = ["dioxus/axum"]
+web = ["dioxus/web"]

packages/fullstack/examples/hello-world/src/main.rs

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+//! Run with:
+//!
+//! ```sh
+//! dx serve --platform fullstack
+//! ```
+
+#![allow(non_snake_case, unused)]
+use dioxus::prelude::*;
+use serde::{Deserialize, Serialize};
+
+fn app() -> Element {
+    let mut count = use_signal(|| 0);
+    let mut text = use_signal(|| "...".to_string());
+    let server_future = use_server_future(get_server_data)?;
+
+    rsx! {
+        h1 { "High-Five counter: {count}" }
+        button { onclick: move |_| count += 1, "Up high!" }
+        button { onclick: move |_| count -= 1, "Down low!" }
+        button {
+            onclick: move |_| async move {
+                if let Ok(data) = get_server_data().await {
+                    println!("Client received: {}", data);
+                    text.set(data.clone());
+                    post_server_data(data).await.unwrap();
+                }
+            },
+            "Run a server function!"
+        }
+        "Server said: {text}"
+    }
+}
+
+#[server]
+async fn post_server_data(data: String) -> Result<(), ServerFnError> {
+    println!("Server received: {}", data);
+
+    Ok(())
+}
+
+#[server]
+async fn get_server_data() -> Result<String, ServerFnError> {
+    Ok(reqwest::get("https://httpbin.org/ip").await?.text().await?)
+}
+
+fn main() {
+    #[cfg(feature = "web")]
+    tracing_wasm::set_as_global_default();
+
+    #[cfg(feature = "server")]
+    tracing_subscriber::fmt::init();
+
+    launch(app);
+}