Add Hunter/Hider role selection on connect with role-scoped modes

Roles are chosen in the bootstrap dev panel before Host/Client. NGO
ConnectionApproval is enabled at runtime and maps the role payload to
the matching prefab variant per connection (Hunter/Hider), so each peer
spawns the correct avatar including the host.

- PlayerRole.cs (new): single source of truth enum { Hider, Hunter }.
- NetworkBootstrap.cs: role toggle, ConnectionApproval + role payload,
  server ApprovalCheck mapping role -> PrefabIdHash.
- NetworkPlayerSetup.cs: serialized PlayerRole field + Role property.
- GameModeManager.cs: BuildModes(role) - Hunter -> [First Person, Paint],
  Hider -> [Third Person, Paint, Free Cam]; binds role from spawned avatar.
- Hunter.prefab: role = Hunter override.
- SampleScene.unity: NetworkBootstrap prefab references wired.

Also includes user inspector scale tuning (Hunter 2.5->2.4, Hider 0.5->0.7).

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

Assets/Scripts/NetworkPlayerSetup.cs

@@ -21,6 +21,14 @@ public class NetworkPlayerSetup : NetworkBehaviour
     [Tooltip("Slots per ring before the radius steps outward, so spacing stays roughly constant as more join.")]
     [SerializeField] private int spawnRingSlots = 8;
 
+    [Header("Role")]
+    [Tooltip("Which side this avatar plays. Baked per prefab variant (Hider on the base/Hider prefab, " +
+             "Hunter on the Hunter prefab); GameModeManager reads it on spawn to build this role's mode set.")]
+    [SerializeField] private PlayerRole role = PlayerRole.Hider;
+
+    /// <summary>The side this avatar plays (Hunter/Hider), baked into the prefab variant.</summary>
+    public PlayerRole Role => role;
+
     public override void OnNetworkSpawn()
     {
         var controller = GetComponent<PlayerCharacterController>();