feat(pack): add Noisium (server-side worldgen optimization)

Noisium speeds up chunk-generation noise, reducing worldgen lag spikes for clients. Server-side only; Chunk pregen (Chunky/DH) benefits too.

mods/noisium.pw.toml

@@ -0,0 +1,13 @@
+name = "Noisium"
+filename = "noisium-neoforge-2.3.0+mc1.21-1.21.1.jar"
+side = "server"
+
+[download]
+url = "https://cdn.modrinth.com/data/KuNKN7d2/versions/nJBE6tif/noisium-neoforge-2.3.0%2Bmc1.21-1.21.1.jar"
+hash-format = "sha512"
+hash = "b50c37d2f69d51742d4407d272cea525b428784d2a39338d34b692937320495cd77d47b2d2321b3976713447028f50823e9ba44ca618900eba4ced907985ec84"
+
+[update]
+[update.modrinth]
+mod-id = "KuNKN7d2"
+version = "nJBE6tif"