Refactor point value object and add observability

server/config/services.yaml

@@ -4,6 +4,9 @@
 # Put parameters here that don't need to change on each machine where the app is deployed
 # https://symfony.com/doc/current/best_practices.html#use-parameters-for-application-configuration
 parameters:
+    app.signal_snapshot_limit: 750
+    app.max_signal_distance_km: 1
+    app.signal_stream_topic: '%env(string:MERCURE_SIGNALS_TOPIC)%'
 
 services:
     # default configuration for services in *this* file
@@ -23,3 +26,4 @@ services:
 
     # add more service definitions when explicit configuration is needed
     # please note that last definitions always *replace* previous ones
+