Upgrade project to Unity ECS 2025 (v1.3.2)

[kstars111]

Major migration from ECS 0.17.0-preview.42 to ECS 1.3.2, updating all deprecated APIs and patterns to modern ECS 2025 standards.

Package Updates:

• com.unity.entities: 0.17.0-preview.42 → 1.3.2
• com.unity.burst: 1.4.11 → 1.8.12
• com.unity.rendering.hybrid → com.unity.entities.graphics: 1.3.2
• Removed com.unity.dots.editor (deprecated)

Conversion System Migration (39 files):

• Migrated all IConvertGameObjectToEntity to Baker pattern
• Replaced GameObjectConversionSystem with Baker.Bake() method
• Updated entity retrieval to use GetEntity(TransformUsageFlags.None)
• Converted EntityManager.AddComponentData() to Baker.AddComponent()
• Converted EntityManager.AddBuffer() to Baker.AddBuffer()

System API Updates (25+ files):

• Replaced GetComponentDataFromEntity() with SystemAPI.GetComponent()
• Replaced GetBufferFromEntity() with GetBufferLookup()
• Updated component writes to use SystemAPI.SetComponent() or SystemAPI.GetComponentRW()
• Migrated BufferFromEntity to BufferLookup in IJob structs

System Architecture Updates:

• Migrated ComponentSystem to SystemBase (3 files)
• Added .Run() to Entities.ForEach blocks in migrated systems
• Updated World.GetOrCreateSystem() to World.GetOrCreateSystemManaged() (19 files)
• Removed deprecated [AlwaysUpdateSystem] attribute (6 files)

Namespace Updates (11 files):

• Changed using Unity.Rendering to using Unity.Entities.Graphics

Transform System Updates:

• Updated Translation/Rotation/Scale to LocalTransform.FromPositionRotationScale()
• Modernized transform component usage in effect systems

Rendering Updates:

• Migrated RenderMesh to RenderMeshUtility.AddComponents() in Bakers
• Updated rendering setup to use RenderMeshDescription and MaterialMeshInfo

All systems now compile with ECS 2025 and follow modern DOTS patterns.