chore: .gitignore, 씬 및 UI/무기 디렉토리 업데이트

- .gitignore: External packages, Sketchfab, Wwise 무시 추가
- Colosseum.slnx: 솔루션 파일 업데이트
- Test.unity: 게임 매니저 및 UI 연동
- UI/, Weapons/ 디렉토리 추가

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

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

Assets/Scenes/Test.unity

@@ -1851,6 +1851,83 @@ Transform:
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   m_Father: {fileID: 0}
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+--- !u!1 &1433547822
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+  m_Component:
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+  - component: {fileID: 1433547824}
+  - component: {fileID: 1433547823}
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+  m_Name: GameManager
+  m_TagString: Untagged
+  m_Icon: {fileID: 0}
+  m_NavMeshLayer: 0
+  m_StaticEditorFlags: 0
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+--- !u!114 &1433547823
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+  m_Name: 
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+  SpawnWithObservers: 1
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+--- !u!114 &1433547824
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+  m_Script: {fileID: 11500000, guid: 7bde02fc6ca2ab0468bb3ce777206089, type: 3}
+  m_Name: 
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+  ShowTopMostFoldoutHeaderGroup: 1
+  gameOverUIPrefab: {fileID: 0}
+  victoryUIPrefab: {fileID: 0}
+  victoryEffectPrefab: {fileID: 0}
+  gameOverRestartDelay: 5
+  victoryToLobbyDelay: 5
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+  m_PrefabAsset: {fileID: 0}
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+  m_LocalScale: {x: 1, y: 1, z: 1}
+  m_ConstrainProportionsScale: 0
+  m_Children: []
+  m_Father: {fileID: 0}
+  m_LocalEulerAnglesHint: {x: 0, y: 0, z: 0}
 --- !u!114 &1716412285 stripped
 MonoBehaviour:
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       propertyPath: m_LocalRotation.w
-      value: 1
+      value: 0
       objectReference: {fileID: 0}
     - target: {fileID: 3122493901255878198, guid: 56986b707b0dc09439cb35ff2f87dcc9, type: 3}
       propertyPath: m_LocalRotation.x
@@ -2149,7 +2226,7 @@ PrefabInstance:
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     - target: {fileID: 3122493901255878198, guid: 56986b707b0dc09439cb35ff2f87dcc9, type: 3}
       propertyPath: m_LocalRotation.y
-      value: 0
+      value: 1
       objectReference: {fileID: 0}
     - target: {fileID: 3122493901255878198, guid: 56986b707b0dc09439cb35ff2f87dcc9, type: 3}
       propertyPath: m_LocalRotation.z
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       propertyPath: m_LocalEulerAnglesHint.z
@@ -2331,3 +2408,4 @@ SceneRoots:
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   - {fileID: 1990079618}
   - {fileID: 1324642684}
+  - {fileID: 1433547825}