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>

Packages/manifest.json

@@ -5,6 +5,7 @@
     "com.unity.ide.visualstudio": "2.0.27",
     "com.unity.inputsystem": "1.19.0",
     "com.unity.multiplayer.center": "1.0.1",
+    "com.unity.netcode.gameobjects": "2.13.0",
     "com.unity.render-pipelines.universal": "17.3.0",
     "com.unity.timeline": "1.8.12",
     "com.unity.ugui": "2.0.0",

Packages/packages-lock.json

@@ -89,9 +89,19 @@
         "com.unity.modules.uielements": "1.0.0"
       }
     },
+    "com.unity.netcode.gameobjects": {
+      "version": "2.13.0",
+      "depth": 0,
+      "source": "registry",
+      "dependencies": {
+        "com.unity.transport": "2.6.0",
+        "com.unity.nuget.mono-cecil": "1.11.4"
+      },
+      "url": "https://packages.unity.com"
+    },
     "com.unity.nuget.mono-cecil": {
       "version": "1.11.6",
-      "depth": 3,
+      "depth": 1,
       "source": "registry",
       "dependencies": {},
       "url": "https://packages.unity.com"
@@ -201,6 +211,17 @@
       },
       "url": "https://packages.unity.com"
     },
+    "com.unity.transport": {
+      "version": "2.6.0",
+      "depth": 1,
+      "source": "registry",
+      "dependencies": {
+        "com.unity.burst": "1.8.24",
+        "com.unity.collections": "2.2.1",
+        "com.unity.mathematics": "1.3.2"
+      },
+      "url": "https://packages.unity.com"
+    },
     "com.unity.ugui": {
       "version": "2.0.0",
       "depth": 0,