Remove argon2id, use bcrypt-only password hashing

src/lib/auth.ts

@@ -96,7 +96,7 @@ export const { handlers, signOut, auth } = NextAuth({
 					return null;
 				}
 
-				// Byte-compatible AtomCMS check (argon2id/bcrypt + md5->argon2id upgrade).
+				// Byte-compatible AtomCMS check (bcrypt + md5->bcrypt upgrade).
 				const res = await checkLogin(password, user.password, {
 					convertPasswords: env.CONVERT_PASSWORDS,
 				});