feat: 투사체 발사 스킬 구현

- SkillProjectile: 서버 권위 이동/충돌, caster 자식 콜라이더 충돌 무시 추가
- SpawnEffect: hitEffect 필드 추가 (투사체 명중 시 적용할 효과 분리)
- SkillEffect: Team 컴포넌트 없는 환경 오브젝트 타겟 제외 처리
- Prefab_Skill_ProjectileBasic 프리팹 생성 (NetworkObject + NetworkTransform + Rigidbody + SphereCollider)
- 투사체 스킬 에셋 추가 (SkillData, SpawnEffect, DamageEffect)
- Anim_Common_찌르기 애니메이션 이벤트 추가 (OnEffect @ 0.867s, OnSkillEnd @ 1.3s)
- DefaultNetworkPrefabs에 Prefab_Skill_ProjectileBasic 등록

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Assets/_Game/Data/Skills/Effects/Data_SkillEffect_Player_투사체_0_데미지.asset

@@ -0,0 +1,28 @@
+%YAML 1.1
+%TAG !u! tag:unity3d.com,2011:
+--- !u!114 &11400000
+MonoBehaviour:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 0}
+  m_Enabled: 1
+  m_EditorHideFlags: 0
+  m_Script: {fileID: 11500000, guid: 58efb3c775496fa40b801b21127a011e, type: 3}
+  m_Name: "Data_SkillEffect_Player_\uD22C\uC0AC\uCCB4_0_\uB370\uBBF8\uC9C0"
+  m_EditorClassIdentifier: Colosseum.Game::Colosseum.Skills.Effects.DamageEffect
+  targetType: 0
+  targetTeam: 0
+  areaCenter: 0
+  areaShape: 0
+  targetLayers:
+    serializedVersion: 2
+    m_Bits: 0
+  areaRadius: 3
+  fanOriginDistance: 1
+  fanRadius: 3
+  fanHalfAngle: 45
+  baseDamage: 15
+  damageType: 2
+  statScaling: 1

Assets/_Game/Data/Skills/Effects/Data_SkillEffect_Player_투사체_0_데미지.asset.meta

@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: afcf53efc3a0ba843a0cd3aca8922542
+NativeFormatImporter:
+  externalObjects: {}
+  mainObjectFileID: 11400000
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/_Game/Data/Skills/Effects/Data_SkillEffect_Player_투사체_1_스폰.asset

@@ -0,0 +1,31 @@
+%YAML 1.1
+%TAG !u! tag:unity3d.com,2011:
+--- !u!114 &11400000
+MonoBehaviour:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 0}
+  m_Enabled: 1
+  m_EditorHideFlags: 0
+  m_Script: {fileID: 11500000, guid: a3139ddf07cfe324fa692a88cd565e24, type: 3}
+  m_Name: "Data_SkillEffect_Player_\uD22C\uC0AC\uCCB4_1_\uC2A4\uD3F0"
+  m_EditorClassIdentifier: Colosseum.Game::Colosseum.Skills.Effects.SpawnEffect
+  targetType: 0
+  targetTeam: 0
+  areaCenter: 0
+  areaShape: 0
+  targetLayers:
+    serializedVersion: 2
+    m_Bits: 0
+  areaRadius: 3
+  fanOriginDistance: 1
+  fanRadius: 3
+  fanHalfAngle: 45
+  prefab: {fileID: 7991191450305394598, guid: b8e3d022f0a2ce84da42fe4afd4a1b13, type: 3}
+  spawnLocation: 1
+  spawnOffset: {x: 0, y: 1, z: 0}
+  parentToCaster: 0
+  autoDestroyTime: 0
+  hitEffect: {fileID: 11400000, guid: afcf53efc3a0ba843a0cd3aca8922542, type: 2}

Assets/_Game/Data/Skills/Effects/Data_SkillEffect_Player_투사체_1_스폰.asset.meta

@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: fa684d4a7ce68d54aa4ce101f9400c35
+NativeFormatImporter:
+  externalObjects: {}
+  mainObjectFileID: 11400000
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: