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

Cargo.lock

@@ -13,6 +13,7 @@ dependencies = [
  "serde_json",
  "thiserror",
  "tracing",
+ "uuid",
 ]
 
 [[package]]
@@ -133,6 +134,7 @@ dependencies = [
  "async-trait",
  "chrono",
  "domain",
+ "serde_json",
  "tokio",
  "uuid",
 ]