feat: 플레이어 다운 및 넉백 피격 반응 추가

- HitReactionController로 다운과 넉백 전용 로직을 분리
- 다운 시작, 루프, 회복 애니메이션과 DownEffect를 연결
- 행동 상태와 스킬 취소가 피격 반응과 연동되도록 정리
- 자동 검증 러너에 다운 및 넉백 검증을 추가

Assets/Scenes/Test.unity

@@ -2491,15 +2491,15 @@ PrefabInstance:
       objectReference: {fileID: 0}
     - target: {fileID: 170188453522781500, guid: 54087b4bd46db9e4fb7da13cf7a6cc69, type: 3}
       propertyPath: m_AnchorMax.x
-      value: 0
+      value: 0.2
       objectReference: {fileID: 0}
     - target: {fileID: 170188453522781500, guid: 54087b4bd46db9e4fb7da13cf7a6cc69, type: 3}
       propertyPath: m_AnchorMax.y
-      value: 0
+      value: 1
       objectReference: {fileID: 0}
     - target: {fileID: 170188453522781500, guid: 54087b4bd46db9e4fb7da13cf7a6cc69, type: 3}
       propertyPath: m_AnchorMin.x
-      value: 0
+      value: 0.2
       objectReference: {fileID: 0}
     - target: {fileID: 222507439395443271, guid: 54087b4bd46db9e4fb7da13cf7a6cc69, type: 3}
       propertyPath: m_Enabled
@@ -2579,15 +2579,15 @@ PrefabInstance:
       objectReference: {fileID: 0}
     - target: {fileID: 2668790415109567114, guid: 54087b4bd46db9e4fb7da13cf7a6cc69, type: 3}
       propertyPath: m_AnchorMax.x
-      value: 0
+      value: 0.2
       objectReference: {fileID: 0}
     - target: {fileID: 2668790415109567114, guid: 54087b4bd46db9e4fb7da13cf7a6cc69, type: 3}
       propertyPath: m_AnchorMax.y
-      value: 0
+      value: 1
       objectReference: {fileID: 0}
     - target: {fileID: 2668790415109567114, guid: 54087b4bd46db9e4fb7da13cf7a6cc69, type: 3}
       propertyPath: m_AnchorMin.x
-      value: 0
+      value: 0.2
       objectReference: {fileID: 0}
     - target: {fileID: 3299919758736932218, guid: 54087b4bd46db9e4fb7da13cf7a6cc69, type: 3}
       propertyPath: m_SizeDelta.x
@@ -4738,7 +4738,7 @@ MonoBehaviour:
   m_Name: 
   m_EditorClassIdentifier: Colosseum.Game::Colosseum.UI.ConnectionUI
   ipAddress: 127.0.0.1
-  port: 7788
+  port: 7777
   autoStartHostInEditor: 0
   connectionStatus: Disconnected
 --- !u!4 &854739757 stripped
@@ -7252,6 +7252,18 @@ PrefabInstance:
       propertyPath: m_AnchorMax.y
       value: 0
       objectReference: {fileID: 0}
+    - target: {fileID: 7035590099291789281, guid: 2122b1e1b36684a40978673f272f200e, type: 3}
+      propertyPath: m_AnchorMax.x
+      value: 1
+      objectReference: {fileID: 0}
+    - target: {fileID: 7035590099291789281, guid: 2122b1e1b36684a40978673f272f200e, type: 3}
+      propertyPath: m_AnchorMax.y
+      value: 1
+      objectReference: {fileID: 0}
+    - target: {fileID: 7035590099291789281, guid: 2122b1e1b36684a40978673f272f200e, type: 3}
+      propertyPath: m_AnchorMin.x
+      value: 1
+      objectReference: {fileID: 0}
     m_RemovedComponents: []
     m_RemovedGameObjects: []
     m_AddedGameObjects: []