WP-01: authentication, user management and application shell

Argon2id password hashing, JWT access tokens with rotating HttpOnly refresh
cookies and reuse detection, login rate limiting, auth audit log, bootstrap
admin, admin-only user CRUD and password reset, OpenAPI spec. Vue login page,
auth store with automatic token refresh, route guards, sidebar shell with
toasts and placeholder pages, user management page.

All tests green: 40 backend, 12 Vitest, 4 Playwright.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

backend/crates/infrastructure/src/token.rs

@@ -0,0 +1,89 @@
+use chrono::{Duration, Utc};
+use domain::auth::AccessClaims;
+use domain::ports::AccessTokenIssuer;
+use domain::user::User;
+use domain::DomainError;
+use jsonwebtoken::{DecodingKey, EncodingKey, Header, Validation};
+
+pub const ACCESS_TOKEN_TTL_MINUTES: i64 = 15;
+
+pub struct JwtIssuer {
+    enc: EncodingKey,
+    dec: DecodingKey,
+    ttl: Duration,
+}
+
+impl JwtIssuer {
+    pub fn new(secret: &str) -> Self {
+        Self {
+            enc: EncodingKey::from_secret(secret.as_bytes()),
+            dec: DecodingKey::from_secret(secret.as_bytes()),
+            ttl: Duration::minutes(ACCESS_TOKEN_TTL_MINUTES),
+        }
+    }
+}
+
+impl AccessTokenIssuer for JwtIssuer {
+    fn issue(&self, user: &User) -> Result<String, DomainError> {
+        let claims = AccessClaims {
+            sub: user.id,
+            role: user.role,
+            exp: (Utc::now() + self.ttl).timestamp(),
+        };
+        jsonwebtoken::encode(&Header::default(), &claims, &self.enc)
+            .map_err(|e| DomainError::Storage(e.to_string()))
+    }
+
+    fn verify(&self, token: &str) -> Result<AccessClaims, DomainError> {
+        jsonwebtoken::decode::<AccessClaims>(token, &self.dec, &Validation::default())
+            .map(|d| d.claims)
+            .map_err(|_| DomainError::InvalidToken)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use domain::user::Role;
+    use uuid::Uuid;
+
+    fn user() -> User {
+        User {
+            id: Uuid::new_v4(),
+            email: "a@x.de".into(),
+            display_name: "A".into(),
+            password_hash: String::new(),
+            role: Role::Admin,
+            is_active: true,
+            created_at: Utc::now(),
+        }
+    }
+
+    #[test]
+    fn issue_and_verify_roundtrip() {
+        let issuer = JwtIssuer::new("0123456789012345678901234567890123456789");
+        let u = user();
+        let claims = issuer.verify(&issuer.issue(&u).unwrap()).unwrap();
+        assert_eq!(claims.sub, u.id);
+        assert_eq!(claims.role, Role::Admin);
+    }
+
+    #[test]
+    fn other_secret_and_expired_tokens_are_rejected() {
+        let a = JwtIssuer::new("0123456789012345678901234567890123456789");
+        let b = JwtIssuer::new("abcdefghijabcdefghijabcdefghijabcdefghij");
+        assert_eq!(
+            b.verify(&a.issue(&user()).unwrap()).unwrap_err(),
+            DomainError::InvalidToken
+        );
+        let expired = JwtIssuer {
+            ttl: Duration::minutes(-10),
+            ..JwtIssuer::new("0123456789012345678901234567890123456789")
+        };
+        assert_eq!(
+            a.verify(&expired.issue(&user()).unwrap()).unwrap_err(),
+            DomainError::InvalidToken
+        );
+        assert_eq!(a.verify("garbage").unwrap_err(), DomainError::InvalidToken);
+    }
+}