fix(battle-node): node_server_url matches prod wire format (no scheme, with path)

Prod do_matching captures (data_dumps/captures/traffic_prod_tk2_*) send
the node URL as host:port/socket.io/ with no scheme prefix —
e.g. "node06.shadowverse.jp:13560/socket.io/". BestHTTP's SocketManager
expects this exact shape; the leading ws:// we were sending plus the
missing /socket.io/ path was preventing the client from completing the
post-do_matching connect (eventually times out with "connection timed
out").

Update BattleNodeOptions default, Program.cs override, and both
controller and bridge tests to use "localhost:5148/socket.io/".

Discovered during v1 smoke walkthrough.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

SVSim.EmulatedEntrypoint/Program.cs

@@ -119,8 +119,9 @@ public class Program
 
         builder.Services.AddBattleNode(opt =>
         {
-            // ASPNETCORE_URLS defaults to http://localhost:5148; we map ws:// onto the same host:port.
-            opt.NodeServerUrl = "ws://localhost:5148";
+            // Matches the prod do_matching wire format: host:port/socket.io/, no scheme prefix.
+            // BestHTTP's SocketManager parses this as the Socket.IO v2 endpoint URL.
+            opt.NodeServerUrl = "localhost:5148/socket.io/";
         });
 
         builder.Services.AddTransient<ShadowverseTranslationMiddleware>();