feat: 적과 충돌 시 미끄러짐 방지 및 8방향 양자화

- OnControllerColliderHit으로 적 충돌 감지
- 충돌 방향으로의 이동만 차단하여 튕겨나가지 않음
- 충돌 normal을 45도 간격으로 양자화하여 8각형 충돌 느낌 구현
- Enemy 레이어 추가

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

Assets/Prefabs/Player/Player.prefab

@@ -107,7 +107,7 @@ MonoBehaviour:
   m_Script: {fileID: 11500000, guid: d5a57f767e5e46a458fc5d3c628d0cbb, type: 3}
   m_Name: 
   m_EditorClassIdentifier: Unity.Netcode.Runtime::Unity.Netcode.NetworkObject
-  GlobalObjectIdHash: 652883547
+  GlobalObjectIdHash: 291279334
   InScenePlacedSourceGlobalObjectIdHash: 0
   DeferredDespawnTick: 0
   Ownership: 1
@@ -134,7 +134,7 @@ MonoBehaviour:
   m_EditorClassIdentifier: Colosseum.Game::Colosseum.Player.PlayerMovement
   ShowTopMostFoldoutHeaderGroup: 1
   moveSpeed: 5
-  rotationSpeed: 10
+  rotationSpeed: 20
   gravity: -9.81
   jumpForce: 5
   skillController: {fileID: 6912018896034183004}