arch: push wire types out of ClientApp, extract event_service, cleanup dead code

- ClientApp stores domain types, RepaintCommand carries DisplayHint + Vec<(String,Value)>
- adapters no longer convert Wire→Domain (eliminated duplication in esp32 + desktop)
- event_service in application layer handles LayoutChanged/WebhookDataReceived/ThemeChanged
- bootstrap event_handler reduced to 10-line dispatcher
- polling_service reuses event_service::apply_and_broadcast (deduplicated broadcast pattern)
- AppState.config_service() replaces 11 inline ConfigService::new() calls
- delete unused poll_interval_secs parameter chain
- delete unused StoragePort/ClientConfig (zero implementations)

.env.example

@@ -2,7 +2,6 @@
 KFRAME_DATABASE_URL=sqlite:kframe.db?mode=rwc
 KFRAME_TCP_ADDR=0.0.0.0:2699
 KFRAME_HTTP_ADDR=0.0.0.0:3000
-KFRAME_POLL_INTERVAL_SECS=5
 
 # Auth (required)
 JWT_SECRET=change-me-to-a-random-secret