Add NGO networking with owner-authoritative player position sync

Install Netcode for GameObjects 2.13.0 + Unity Transport 2.6.0 and wire up
the first networking milestone: syncing player position/rotation across clients.

- NetworkBootstrap: Host/Client/Server controls (OnGUI + H/C hotkeys) for
  local clone testing over loopback 127.0.0.1:7777.
- NetworkPlayerSetup: per-avatar owner gating. The local owner binds the
  GameModeManager and cameras to itself; remote avatars disable their
  controller/CharacterController and receive transform via NetworkTransform.
- GameModeManager.BindLocalPlayer: central runtime rebind to the locally
  spawned player.
- FirstPersonController.SetPlayer: explicit runtime rebind hook.
- Player prefab: NetworkObject + NetworkTransform (owner-authoritative,
  position + rotation) + NetworkPlayerSetup; registered as PlayerPrefab.
- Scene: NetworkManager + UnityTransport added; the fixed scene player
  instance removed in favor of spawn-on-connect.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Assets/Prefabs/Player.prefab

@@ -45,6 +45,9 @@ GameObject:
   - component: {fileID: 4587432968399885263}
   - component: {fileID: 3810343734243857883}
   - component: {fileID: 273411532115212066}
+  - component: {fileID: 1557561356852236266}
+  - component: {fileID: 6847253018511389861}
+  - component: {fileID: 8574096554986372233}
   m_Layer: 0
   m_Name: Player
   m_TagString: Player
@@ -208,6 +211,91 @@ MonoBehaviour:
   m_EditorClassIdentifier: Assembly-CSharp::PlayerScaler
   scale: 1
   scaleJumpAndGravity: 1
+--- !u!114 &1557561356852236266
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+  GlobalObjectIdHash: 0
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+  AlwaysReplicateAsRoot: 0
+  SynchronizeTransform: 1
+  <InScenePlaced>k__BackingField: 0
+  ActiveSceneSynchronization: 0
+  SceneMigrationSynchronization: 1
+  SpawnWithObservers: 1
+  DontDestroyWithOwner: 0
+  AutoObjectParentSync: 1
+  SyncOwnerTransformWhenParented: 1
+  AllowOwnerToParent: 0
+--- !u!114 &6847253018511389861
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+  NetworkTransformExpanded: 0
+  AutoOwnerAuthorityTickOffset: 1
+  PositionInterpolationType: 0
+  RotationInterpolationType: 0
+  ScaleInterpolationType: 0
+  PositionLerpSmoothing: 1
+  PositionMaxInterpolationTime: 0.1
+  RotationLerpSmoothing: 1
+  RotationMaxInterpolationTime: 0.1
+  ScaleLerpSmoothing: 1
+  ScaleMaxInterpolationTime: 0.1
+  AuthorityMode: 1
+  TickSyncChildren: 0
+  UseUnreliableDeltas: 0
+  SyncPositionX: 1
+  SyncPositionY: 1
+  SyncPositionZ: 1
+  SyncRotAngleX: 1
+  SyncRotAngleY: 1
+  SyncRotAngleZ: 1
+  SyncScaleX: 0
+  SyncScaleY: 0
+  SyncScaleZ: 0
+  PositionThreshold: 0.001
+  RotAngleThreshold: 0.01
+  ScaleThreshold: 0.01
+  UseQuaternionSynchronization: 0
+  UseQuaternionCompression: 0
+  UseHalfFloatPrecision: 0
+  InLocalSpace: 0
+  SwitchTransformSpaceWhenParented: 0
+  Interpolate: 1
+  SlerpPosition: 0
+--- !u!114 &8574096554986372233
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 --- !u!1 &6840099669803454162
 GameObject:
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