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-desktop/src/main.rs

@@ -1,4 +1,4 @@
-use client_application::{ClientApp, conversions, run_connection_loop};
+use client_application::{ClientApp, RepaintCommand, run_connection_loop};
 use client_domain::{
     BoundingBox, DisplayPort, FontMetrics, RenderEngine, RepaintRequest, ThemeConfig,
     WidgetRenderer,
@@ -10,6 +10,16 @@ use std::thread;
 use std::time::{Duration, Instant};
 use tcp_client::StdTcpClient;
 
+fn to_request(cmd: &RepaintCommand) -> RepaintRequest {
+    RepaintRequest {
+        widget_id: cmd.widget_id,
+        bounds: cmd.bounds,
+        display_hint: cmd.display_hint.clone(),
+        data: cmd.data.clone(),
+        error: cmd.error.clone(),
+    }
+}
+
 fn main() {
     let screen = BoundingBox::screen(240, 320);
     let mut app = ClientApp::new(screen);
@@ -56,30 +66,7 @@ fn main() {
                 if !repaints.is_empty() {
                     println!("\n--- Repaint ({} widgets) ---", repaints.len());
 
-                    let requests: Vec<RepaintRequest> = repaints
-                        .iter()
-                        .map(|cmd| RepaintRequest {
-                            widget_id: cmd.widget_id,
-                            bounds: cmd.bounds,
-                            display_hint: conversions::wire_to_display_hint(
-                                cmd.display_hint.clone(),
-                            ),
-                            data: cmd
-                                .state
-                                .data
-                                .iter()
-                                .map(|kv| {
-                                    (kv.key.clone(), conversions::wire_to_value(kv.value.clone()))
-                                })
-                                .collect(),
-                            error: cmd
-                                .state
-                                .error
-                                .as_ref()
-                                .map(|e| conversions::wire_to_widget_error(e.clone())),
-                        })
-                        .collect();
-
+                    let requests: Vec<_> = repaints.iter().map(to_request).collect();
                     let bg = engine.theme().background;
                     let updates = renderer.apply_repaints(&engine, requests);
                     for update in &updates {