feat(battle-node): IMatchingBridge + MatchingBridge mint battle id + node url

SVSim.UnitTests/BattleNode/Bridge/MatchingBridgeTests.cs

@@ -0,0 +1,35 @@
+using NUnit.Framework;
+using SVSim.BattleNode.Bridge;
+using SVSim.BattleNode.Sessions;
+
+namespace SVSim.UnitTests.BattleNode.Bridge;
+
+[TestFixture]
+public class MatchingBridgeTests
+{
+    [Test]
+    public void RegisterPendingBattle_RegistersInStoreAndReturnsNodeUrl()
+    {
+        var store = new InMemoryBattleSessionStore();
+        var bridge = new MatchingBridge(store, new BattleNodeOptions { NodeServerUrl = "ws://localhost:5148" });
+
+        var match = bridge.RegisterPendingBattle(viewerId: 906243102);
+
+        Assert.That(match.NodeServerUrl, Is.EqualTo("ws://localhost:5148"));
+        Assert.That(match.BattleId, Is.Not.Empty);
+        var pending = store.TryGetPending(match.BattleId);
+        Assert.That(pending, Is.Not.Null);
+        Assert.That(pending!.ViewerId, Is.EqualTo(906243102));
+    }
+
+    [Test]
+    public void RegisterPendingBattle_MintsUniqueBattleIds()
+    {
+        var bridge = new MatchingBridge(new InMemoryBattleSessionStore(), new BattleNodeOptions());
+
+        var a = bridge.RegisterPendingBattle(1);
+        var b = bridge.RegisterPendingBattle(2);
+
+        Assert.That(a.BattleId, Is.Not.EqualTo(b.BattleId));
+    }
+}