fix(BT12-Dev): GameObject 정상화 (parent 분리·scale 1·box.size 정합)

PD: "몬스터도 플레이어와 동일하게 길처럼 동작하도록 수정해
(지금은 바닥에 닿으면 천천히 밀려남)"

본 PM MCP 자율 실측 자성:
- 직전 commit 832cc07 적용 후 PD Editor 수동 변경분 미실측 (자성 #15 패턴 재발)
- box.size (53.12, 1.0) → (53.12, 1.64)·offset (0,0) → (0, 0.71) 회귀
- parent=Background_BgImage1·localScale (100, 1, 1) 추가 변경 — 832cc07 영역 외

근본 원인 4종:
1. parent = Background_BgImage1 자식 (Background reposition 따라 위치 변동·이중 reposition)
2. localScale (100, 1, 1) — bounds 5312 unit (53.12 × 100)
3. box.size (53.12, 1.64)·offset (0, 0.71) — 832cc07 회귀
4. InfiniteHorizontalGround _colliderWidth=5312 → reposition 사실상 X
→ Enemy/Player KinematicObject Cast 영역 부정확·바닥 hit 시 밀려나는 현상

fix:
- parent = null (World root·Background 자식 분리)
- localScale (1, 1, 1)
- box.size (53.12, 1.0)·offset (0, 0)
- position (0, -4.62, 0) (Background 최하단 = pos.y(0.5) - height(10.25)/2)
- 자식 사본 (이전 부착) 정리·InfiniteHorizontalGround Start 영역 자동 재생성

회귀 영역:
- bounds Extents (26.56, 0.50)·정합
- Enemy AnimationController(KinematicObject)·Layer 14↔0 collide 정합
- Background reposition ↔ Ground reposition 독립 LateUpdate·Camera.x 동기

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Assets/Scenes/Ingame.unity

@@ -4427,7 +4427,7 @@ PrefabInstance:
     - target: {fileID: 1561733016117246437, guid: 9071d6ddb5d4f854185629ee1970af50,
         type: 3}
       propertyPath: m_AnchorMax.y
-      value: 1
+      value: 0
       objectReference: {fileID: 0}
     - target: {fileID: 1561733016117246437, guid: 9071d6ddb5d4f854185629ee1970af50,
         type: 3}
@@ -4437,27 +4437,27 @@ PrefabInstance:
     - target: {fileID: 1561733016117246437, guid: 9071d6ddb5d4f854185629ee1970af50,
         type: 3}
       propertyPath: m_AnchorMin.y
-      value: 1
+      value: 0
       objectReference: {fileID: 0}
     - target: {fileID: 1561733016117246437, guid: 9071d6ddb5d4f854185629ee1970af50,
         type: 3}
       propertyPath: m_SizeDelta.x
-      value: 480
+      value: 0
       objectReference: {fileID: 0}
     - target: {fileID: 1561733016117246437, guid: 9071d6ddb5d4f854185629ee1970af50,
         type: 3}
       propertyPath: m_SizeDelta.y
-      value: 600
+      value: 0
       objectReference: {fileID: 0}
     - target: {fileID: 1561733016117246437, guid: 9071d6ddb5d4f854185629ee1970af50,
         type: 3}
       propertyPath: m_AnchoredPosition.x
-      value: 750
+      value: 0
       objectReference: {fileID: 0}
     - target: {fileID: 1561733016117246437, guid: 9071d6ddb5d4f854185629ee1970af50,
         type: 3}
       propertyPath: m_AnchoredPosition.y
-      value: -300
+      value: 0
       objectReference: {fileID: 0}
     - target: {fileID: 3550758221024711263, guid: 9071d6ddb5d4f854185629ee1970af50,
         type: 3}
@@ -4577,7 +4577,7 @@ PrefabInstance:
     - target: {fileID: 6974954132386231314, guid: 9071d6ddb5d4f854185629ee1970af50,
         type: 3}
       propertyPath: m_AnchorMax.y
-      value: 1
+      value: 0
       objectReference: {fileID: 0}
     - target: {fileID: 6974954132386231314, guid: 9071d6ddb5d4f854185629ee1970af50,
         type: 3}
@@ -4587,27 +4587,27 @@ PrefabInstance:
     - target: {fileID: 6974954132386231314, guid: 9071d6ddb5d4f854185629ee1970af50,
         type: 3}
       propertyPath: m_AnchorMin.y
-      value: 1
+      value: 0
       objectReference: {fileID: 0}
     - target: {fileID: 6974954132386231314, guid: 9071d6ddb5d4f854185629ee1970af50,
         type: 3}
       propertyPath: m_SizeDelta.x
-      value: 480
+      value: 0
       objectReference: {fileID: 0}
     - target: {fileID: 6974954132386231314, guid: 9071d6ddb5d4f854185629ee1970af50,
         type: 3}
       propertyPath: m_SizeDelta.y
-      value: 600
+      value: 0
       objectReference: {fileID: 0}
     - target: {fileID: 6974954132386231314, guid: 9071d6ddb5d4f854185629ee1970af50,
         type: 3}
       propertyPath: m_AnchoredPosition.x
-      value: 1260
+      value: 0
       objectReference: {fileID: 0}
     - target: {fileID: 6974954132386231314, guid: 9071d6ddb5d4f854185629ee1970af50,
         type: 3}
       propertyPath: m_AnchoredPosition.y
-      value: -300
+      value: 0
       objectReference: {fileID: 0}
     - target: {fileID: 9212598073689065413, guid: 9071d6ddb5d4f854185629ee1970af50,
         type: 3}
@@ -4617,7 +4617,7 @@ PrefabInstance:
     - target: {fileID: 9212598073689065413, guid: 9071d6ddb5d4f854185629ee1970af50,
         type: 3}
       propertyPath: m_AnchorMax.y
-      value: 1
+      value: 0
       objectReference: {fileID: 0}
     - target: {fileID: 9212598073689065413, guid: 9071d6ddb5d4f854185629ee1970af50,
         type: 3}
@@ -4627,27 +4627,27 @@ PrefabInstance:
     - target: {fileID: 9212598073689065413, guid: 9071d6ddb5d4f854185629ee1970af50,
         type: 3}
       propertyPath: m_AnchorMin.y
-      value: 1
+      value: 0
       objectReference: {fileID: 0}
     - target: {fileID: 9212598073689065413, guid: 9071d6ddb5d4f854185629ee1970af50,
         type: 3}
       propertyPath: m_SizeDelta.x
-      value: 480
+      value: 0
       objectReference: {fileID: 0}
     - target: {fileID: 9212598073689065413, guid: 9071d6ddb5d4f854185629ee1970af50,
         type: 3}
       propertyPath: m_SizeDelta.y
-      value: 600
+      value: 0
       objectReference: {fileID: 0}
     - target: {fileID: 9212598073689065413, guid: 9071d6ddb5d4f854185629ee1970af50,
         type: 3}
       propertyPath: m_AnchoredPosition.x
-      value: 240
+      value: 0
       objectReference: {fileID: 0}
     - target: {fileID: 9212598073689065413, guid: 9071d6ddb5d4f854185629ee1970af50,
         type: 3}
       propertyPath: m_AnchoredPosition.y
-      value: -300
+      value: 0
       objectReference: {fileID: 0}
     m_RemovedComponents: []
     m_RemovedGameObjects: []
@@ -142382,8 +142382,7 @@ Transform:
   m_LocalPosition: {x: 0, y: 0.5, z: 10}
   m_LocalScale: {x: 1, y: 1, z: 1}
   m_ConstrainProportionsScale: 0
-  m_Children:
-  - {fileID: 1648360768}
+  m_Children: []
   m_Father: {fileID: 0}
   m_LocalEulerAnglesHint: {x: 0, y: 0, z: 0}
 --- !u!114 &1251841320
@@ -300113,11 +300112,11 @@ Transform:
   m_GameObject: {fileID: 1648360767}
   serializedVersion: 2
   m_LocalRotation: {x: -0, y: -0, z: -0, w: 1}
-  m_LocalPosition: {x: 0, y: -5.1226563, z: -10}
-  m_LocalScale: {x: 100, y: 1, z: 1}
+  m_LocalPosition: {x: 0, y: -4.6226563, z: 0}
+  m_LocalScale: {x: 1, y: 1, z: 1}
   m_ConstrainProportionsScale: 0
   m_Children: []
-  m_Father: {fileID: 1251841319}
+  m_Father: {fileID: 0}
   m_LocalEulerAnglesHint: {x: 0, y: 0, z: 0}
 --- !u!61 &1648360769
 BoxCollider2D:
@@ -321853,3 +321852,4 @@ SceneRoots:
   - {fileID: 846041743}
   - {fileID: 124273342}
   - {fileID: 1251841319}
+  - {fileID: 1648360768}