M1: add replicated Player capsule prefab, set as NetworkConfig.PlayerPrefab

Capsule with Rigidbody (mass 2, upright constraints) + NetworkObject +
NetworkTransform + PlayerDriver; auto-spawned per client, host-authoritative
motion via input->ServerRpc->host AddForce->NetworkTransform replication.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Assets/DefaultNetworkPrefabs.asset

@@ -13,4 +13,9 @@ MonoBehaviour:
   m_Name: DefaultNetworkPrefabs
   m_EditorClassIdentifier: Unity.Netcode.Runtime::Unity.Netcode.NetworkPrefabsList
   IsDefault: 1
-  List: []
+  List:
+  - Override: 0
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+    SourcePrefabToOverride: {fileID: 0}
+    SourceHashToOverride: 0
+    OverridingTargetPrefab: {fileID: 0}

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Assets/Prefabs/Player.prefab

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+  PositionLerpSmoothing: 1
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+  AuthorityMode: 0
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Assets/Prefabs/Player.prefab.meta

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Assets/Scenes/M1_Arena.unity

@@ -531,7 +531,7 @@ MonoBehaviour:
   NetworkConfig:
     ProtocolVersion: 0
     NetworkTransport: {fileID: 1571629440}
-    PlayerPrefab: {fileID: 0}
+    PlayerPrefab: {fileID: 1972506626464022285, guid: d5fa70ee7813c62479bdedf080cf16ab, type: 3}
     Prefabs:
       NetworkPrefabsLists:
       - {fileID: 11400000, guid: 26dc7ddf766d17a4f81221bfec5c38f7, type: 2}