More fullstack fixes (#4737)

* allow `--server` only builds!

* rollback example

* capture `/:route` routes

* fix: properly implement file uploads in forms

* implement desktop form uploads

* Performant serialization of form bytes

* finish up file stuff

* cleanups

* add request headers to streaming context

* remove some unwraps

packages/cli/src/serve/output.rs

@@ -268,12 +268,12 @@ impl Output {
             }
             KeyCode::Char('D') => {
                 return Ok(Some(ServeUpdate::OpenDebugger {
-                    id: BuildId::SERVER,
+                    id: BuildId::SECONDARY,
                 }));
             }
             KeyCode::Char('d') => {
                 return Ok(Some(ServeUpdate::OpenDebugger {
-                    id: BuildId::CLIENT,
+                    id: BuildId::PRIMARY,
                 }));
             }
             KeyCode::Char('c') => {