fix: os.signal_opt API callback-based (V latest)

La nouvelle API est fn(os.Signal, fn(os.Signal)) au lieu de
chan+variadic. Enregistrement séparé pour .hup, .int, .term.

server.v

@@ -120,30 +120,34 @@ pub fn (mut app App) run() ! {
 
 $if linux || macos {
 	fn (mut app App) handle_signals() {
-		mut sigch := chan os.Signal{cap: 10}
-		os.signal_opt(mut sigch, .int, .term, .hup) or { panic(err) }
-		for {
-			sig := <-sigch
-			match sig {
-				.hup {
-					app.logger.info('server', 'reload', 'SIGHUP received, reloading config...')
-					new_cfg := load_config(app.config_path) or {
-						app.logger.error('server', 'reload', 'failed to reload config: ${err}')
-						continue
-					}
-					app.cfg = new_cfg
-					app.webhook_routes = build_webhook_routes(new_cfg)
-					app.ntfy = new_ntfy_client(new_cfg.server, app.logger)
-					app.dedup = new_dedup(new_cfg.dedup)
-					app.logger.info('server', 'reload', 'config reloaded successfully')
-				}
-				.int, .term {
-					app.logger.info('server', 'shutdown', 'received signal, shutting down...')
-					app.shutdown_flag = true
-					time.sleep(500 * time.millisecond)
-					exit(0)
-				}
+		// Register SIGHUP handler for config reload
+		os.signal_opt(.hup, fn [mut app] (sig os.Signal) {
+			app.logger.info('server', 'reload', 'SIGHUP received, reloading config...')
+			new_cfg := load_config(app.config_path) or {
+				app.logger.error('server', 'reload', 'failed to reload config: ${err}')
+				return
 			}
+			app.cfg = new_cfg
+			app.webhook_routes = build_webhook_routes(new_cfg)
+			app.ntfy = new_ntfy_client(new_cfg.server, app.logger)
+			app.dedup = new_dedup(new_cfg.dedup)
+			app.logger.info('server', 'reload', 'config reloaded successfully')
+		}) or { panic(err) }
+
+		// Common shutdown handler for SIGINT and SIGTERM
+		shutdown := fn [mut app] (sig os.Signal) {
+			app.logger.info('server', 'shutdown', 'received signal, shutting down...')
+			app.shutdown_flag = true
+			time.sleep(500 * time.millisecond)
+			exit(0)
+		}
+
+		os.signal_opt(.int, shutdown) or { panic(err) }
+		os.signal_opt(.term, shutdown) or { panic(err) }
+
+		// Keep goroutine alive
+		for {
+			time.sleep(60 * time.second)
 		}
 	}
 }