feat: redesign match play and add broadcast tooling

src/lib/auth-identity.ts

@@ -0,0 +1,21 @@
+/** Better Auth requires an email internally; this is never a contact address. */
+export const AUTH_EMAIL_DOMAIN = 'identity.invalid';
+
+export function contactEmail(value: string | null | undefined): string | null {
+	const email = value?.trim().toLowerCase();
+	if (!email || /@(?:osu\.local|discord\.local|identity\.invalid)$/.test(email)) return null;
+	return email;
+}
+
+export function newAuthIdentity(): string {
+	return `${crypto.randomUUID()}@${AUTH_EMAIL_DOMAIN}`;
+}
+
+export interface ConnectionProfile {
+	username: string;
+	image: string | null;
+	email: string | null;
+	emailVerified: boolean;
+	countryCode?: string | null;
+	globalRank?: number | null;
+}