feat: Add JWT-based authentication and authorization module with token generation, validation, and secure cookie management.

Author: zerox80

backend/src/auth.rs

@@ -33,6 +33,8 @@ use chrono::{Duration, Utc};
 use jsonwebtoken::{decode, encode, DecodingKey, EncodingKey, Header, Validation};
 use once_cell::sync::Lazy;
 use serde::{Deserialize, Serialize};
+use std::sync::OnceLock;
+use std::collections::HashSet;
 use std::env;
 use time::{Duration as TimeDuration, OffsetDateTime};