Consolidate auth routes under /auth and rename /u to /user

Moves the login screen from /login to /auth, logout from /logout to
/auth/logout (alongside the existing /auth/login and /auth/callback
endpoints), and the public profile route from /u/[id] to /user/[id].

AUTH_REDIRECT_URI and AUTH_POST_LOGOUT_URI already point at
/auth/callback and / respectively, so no Zitadel config change is
needed for the auth move.

web-player/src/lib/server/api.ts

@@ -19,7 +19,7 @@ export function createApiClient({ fetch, accessToken }: ApiClientOptions) {
 
 export function requireUser(locals: App.Locals, url: URL): SessionUser {
 	if (!locals.user)
-		redirect(302, `/login?returnTo=${encodeURIComponent(url.pathname + url.search)}`);
+		redirect(302, `/auth?returnTo=${encodeURIComponent(url.pathname + url.search)}`);
 	return locals.user;
 }
 
@@ -30,7 +30,7 @@ export function optionalUser(
 ): SessionUser | null {
 	if (locals.user) return locals.user;
 	if (!allowAnonymousListening)
-		redirect(302, `/login?returnTo=${encodeURIComponent(url.pathname + url.search)}`);
+		redirect(302, `/auth?returnTo=${encodeURIComponent(url.pathname + url.search)}`);
 	return null;
 }