Really Fast Paintings v2.0.0

Minecraft 26.3 release for Fabric.

• Updated painting placement, persistence, rendering, and metadata for Minecraft 26.3.
• Requires Fabric Loader 0.19.5 or newer, Fabric API 0.161.0 or newer for 26.3, and Java 25.
• Keeps Distant Decorations 2.0.0 optional. Its published Modrinth artifact supplies the compile API.
• Added client GameTests that enter a world, render a 2×2 painting, and exercise Distant Decorations record delivery and distant render submission.

Changes since v1.1.0