Configure VM services and fix auth flow

- point MySQL and Whisper settings to the VM
- add VM MySQL bootstrap scripts and docs
- allow LAN Vite origins for CORS
- fix Express 5 validation assignment crash
- allow login with username or email
- prevent recursive auth refresh retries

frontend/src/hooks/use-mobile.tsx

@@ -0,0 +1,19 @@
+import * as React from "react";
+
+const MOBILE_BREAKPOINT = 768;
+
+export function useIsMobile() {
+  const [isMobile, setIsMobile] = React.useState<boolean | undefined>(undefined);
+
+  React.useEffect(() => {
+    const mql = window.matchMedia(`(max-width: ${MOBILE_BREAKPOINT - 1}px)`);
+    const onChange = () => {
+      setIsMobile(window.innerWidth < MOBILE_BREAKPOINT);
+    };
+    mql.addEventListener("change", onChange);
+    setIsMobile(window.innerWidth < MOBILE_BREAKPOINT);
+    return () => mql.removeEventListener("change", onChange);
+  }, []);
+
+  return !!isMobile;
+}