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.UnitTests/Controllers/ArenaTwoPickBattleControllerTests.cs

@@ -28,7 +28,10 @@ public class ArenaTwoPickBattleControllerTests
         var battleId = root.GetProperty("battle_id").GetString();
         Assert.That(battleId, Is.Not.Null.And.Not.Empty);
         var nodeUrl = root.GetProperty("node_server_url").GetString();
-        Assert.That(nodeUrl, Does.StartWith("ws://"));
+        // Matches prod wire format: host:port/socket.io/, no scheme prefix.
+        Assert.That(nodeUrl, Does.Contain("/socket.io/"));
+        Assert.That(nodeUrl, Does.Not.StartWith("ws://"));
+        Assert.That(nodeUrl, Does.Not.StartWith("http://"));
         // Required when matching_state ∈ {3004,3007,3011} per
         // DoMatchingBase.SettingCardMasterId; client throws KeyNotFoundException without it.
         Assert.That(root.GetProperty("card_master_id").GetInt32(), Is.EqualTo(1));