Migrate Inventory Texture .renderTexture to a newer Unity serialized format and add compatibility flags. Replaced legacy prefab refs with m_CorrespondingSourceObject/m_PrefabInstance/m_PrefabAsset, bumped serializedVersion, and added fields such as m_IsAlphaChannelOptional, m_MipCount, m_DepthStencilFormat, m_ColorFormat, m_UseDynamicScale, m_UseDynamicScaleExplicit, m_BindMS, m_EnableCompatibleFormat, m_EnableRandomWrite and m_ShadowSamplingMode. This aligns the asset with newer Unity RenderTexture schema without changing intended texture dimensions or usage.
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