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)

crates/client-domain/src/lib.rs

@@ -19,7 +19,7 @@ pub use domain::{AlignItems, DisplayHintKind, HAlign, JustifyContent, VAlign};
 pub use font::{FontMetrics, FontSize};
 pub use layout_engine::LayoutEngine;
 pub use markup::{TextSpan, parse_markup};
-pub use ports::{ClientConfig, DisplayPort, NetworkPort, StoragePort};
+pub use ports::{DisplayPort, NetworkPort};
 pub use render_engine::{DrawCommand, RenderEngine};
 pub use render_tree::RenderTree;
 pub use scroll::ScrollState;

crates/client-domain/src/ports/mod.rs

@@ -1,7 +1,5 @@
 mod display;
 mod network;
-mod storage;
 
 pub use display::DisplayPort;
 pub use network::NetworkPort;
-pub use storage::{ClientConfig, StoragePort};

crates/client-domain/src/ports/storage.rs

@@ -1,11 +0,0 @@
-pub struct ClientConfig {
-    pub wifi_ssid: String,
-    pub wifi_password: String,
-    pub server_addr: String,
-}
-
-pub trait StoragePort {
-    type Error;
-
-    fn load_config(&self) -> Result<ClientConfig, Self::Error>;
-}