fix(presentation): extract 12 handler violations to use cases

- TokenService port + JwtTokenService adapter; login/refresh return LoginResult
- delete get_token (dup of login); create_tokens helper removed
- type UpdateChannelRequest schedule_config/recycle_policy (no serde_json::Value)
- update_settings returns updated Vec; handler calls one use case
- config use case in application::config; handler maps DTO only
- SyncStatusEntry moved to api-types w/ From<LibrarySyncLogEntry>
- trigger_sync: Conflict error, drop sync_trigger.send from handler
- UpsertProviderCommand.config accepts Value; serialization in use case
- get_current_broadcast returns BroadcastWithChannel; one call
- get_stream_url resolves broadcast internally; handler single call

crates/domain/src/ports/mod.rs

@@ -11,7 +11,7 @@ pub mod transcode;
 pub mod user;
 
 pub use activity::{ActivityLogCommand, ActivityLogQuery};
-pub use auth::AuthService;
+pub use auth::{AuthService, TokenService};
 pub use channel::{ChannelCommand, ChannelQuery};
 pub use events::{DomainEvent, EventConsumer, EventHandler, EventPublisher};
 pub use library::{LibraryCommand, LibraryQuery, LibrarySyncAdapter};