feat: auth hardening + codebase quality sweep

Refresh tokens: RefreshToken entity, PostgresRefreshTokenRepository,
login returns refresh token, POST /auth/refresh (rotation), POST /auth/logout,
JWT expiry 24h→1h, configurable via with_expiry().

Route protection: require_auth middleware on protected routes,
public routes split (register, login, refresh, sharing/access).

Authorization: caller_id added to ReadAssetFileQuery, ReadDerivativeQuery,
GetStackQuery, DeleteStackCommand with ownership checks. Admin-only gates
on processing, storage, sidecar, duplicates handlers.

Quality fixes: visibility filtering bypass in search(), unwrap panics in
date parsing, DRY auth header parsing, centralized parsers module,
email validation via email_address crate, value objects (Username, MimeType,
RelativePath), domain events (UserCreated, UserDeleted, AlbumCreated,
TagCreated, DuplicateDetected), postgres error mapping for constraint
violations, OptionExt::or_not_found helper, in_memory_repo! macro,
GetStackQuery moved to queries, album add_entry 200→201.

crates/domain/src/identity/ports.rs

@@ -1,4 +1,4 @@
-use super::entities::{Group, Role, User};
+use super::entities::{Group, RefreshToken, Role, User};
 use crate::common::errors::DomainError;
 use crate::common::value_objects::{Email, PasswordHash, SystemId};
 use async_trait::async_trait;
@@ -35,6 +35,16 @@ pub trait GroupRepository: Send + Sync {
     async fn delete(&self, id: &SystemId) -> Result<(), DomainError>;
 }
 
+// --- RefreshTokenRepository ---
+
+#[async_trait]
+pub trait RefreshTokenRepository: Send + Sync {
+    async fn save(&self, token: &RefreshToken) -> Result<(), DomainError>;
+    async fn find_by_hash(&self, token_hash: &str) -> Result<Option<RefreshToken>, DomainError>;
+    async fn delete_by_user(&self, user_id: &SystemId) -> Result<(), DomainError>;
+    async fn delete(&self, id: &SystemId) -> Result<(), DomainError>;
+}
+
 // --- Auth ---
 
 #[async_trait]