feat(pack): packwiz init (NeoForge 1.21.1) + curation README

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

pack/README.md

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+# Ulicraft modpack (packwiz)
+
+This directory is the **single source of truth** for the modpack (MC 1.21.1, NeoForge 21.1.209). Curate mods from here with `packwiz modrinth add <slug>` (prefer Modrinth over CurseForge); each mod produces a `mods/<slug>.pw.toml` metadata file referencing the upstream CDN. **Client-only mods must be tagged `side = "client"`** in their `.pw.toml` so the itzg server does not pull and crash on them. After adding/removing mods run `packwiz refresh` to recompute `index.toml`; for offline LAN play run `tooling/mirror-mods.sh` to vendor the jars and rewrite the download URLs to the local Caddy mirror. Curation is an ongoing manual task — no mods are added yet.

pack/index.toml

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+hash-format = "sha256"
+files = []

pack/pack.toml

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+name = "Ulicraft"
+author = "Oier"
+version = "1.0.0"
+pack-format = "packwiz:1.1.0"
+
+[index]
+file = "index.toml"
+hash-format = "sha256"
+hash = "7b81c9e9d9e6e21a9865a2dded0dfd77e7683d679b98fe5b0114eaed9a31f17e"
+
+[versions]
+minecraft = "1.21.1"
+neoforge = "21.1.209"