feat(app-tauri): option de lancement auto du serveur web au démarrage

Ajoute le déclenchement du serveur embarqué dès le démarrage d'IdeA
selon la préférence utilisateur, sans action manuelle requise.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

crates/app-tauri/src/lib.rs

@@ -30,6 +30,7 @@ pub mod tickets;
 
 use std::process::ExitCode;
 use std::sync::atomic::{AtomicBool, Ordering};
+use std::sync::Arc;
 
 use application::{AppError, GetAppExitWorkGuardStateInput, SnapshotOpenWindowsInput};
 use domain::{
@@ -152,7 +153,18 @@ pub fn run() {
             // Wire the domain event bus → Tauri events relay.
             events::spawn_relay(app.handle().clone(), &app_state.event_bus);
 
+            let embedded_server = Arc::clone(&app_state.embedded_server);
+            let core = app_state.core();
             app.manage(app_state);
+            tauri::async_runtime::spawn(async move {
+                if let Err(err) = embedded_server.auto_start_if_enabled(core).await {
+                    application::diag!(
+                        "[embedded-server] auto-start failed: {}: {}",
+                        err.code,
+                        err.message
+                    );
+                }
+            });
 
             // Kill all live PTYs cleanly when the main window is closing. This is
             // independent of the per-view (navigation/layout) lifecycle — those