Fix some CI (windows + nasm, core-macro error) (#2676)

* Moves index.html creation until after wasm creation so the webserver doesn't prematurely serve the page
* sets up nasm for windows builds (to be superseded by Remove Dioxus CLI NASM dependency #2666 #2682)
* puts magnanis-cli-support in a blocking task to prevent threadlocking during sequential builds
* changes order of client/server builds such that the client is built before the server so the webserver doesn't prematurely serve invalid client code
* declobbers "serve" such that each project gets a different dir in the target folder
* uses nest_service instead of fallback so the router doesn't respond with fallback codes
* reincorporates doge's fix from Fix hot-reloading on Windows #2544

packages/cli/src/serve/output.rs

@@ -86,7 +86,7 @@ enum Tab {
 type TerminalBackend = Terminal<CrosstermBackend<io::Stdout>>;
 
 impl Output {
-    pub async fn start(cfg: &Serve) -> io::Result<Self> {
+    pub fn start(cfg: &Serve) -> io::Result<Self> {
         let interactive = std::io::stdout().is_tty() && cfg.interactive.unwrap_or(true);
 
         let mut events = None;