Add LAN party modpack, server automation, and client install scripts

Covers the Create + Farmer's Delight modpack list, food roadmap pool,
cross-platform client bootstrap (offline account + modpack + auto-join),
and the venue-box server setup (lazymc idle sleep/wake, Chunky pregen,
file distribution).

.gitignore

@@ -0,0 +1,8 @@
+# generated locally by server/setup-server.sh — don't commit the actual server/binaries
+server/mcserver/
+server/lazymc
+server/lazymc.toml
+
+# generated locally when building the client modpack — too large / personal for git
+server/dist/*.zip
+*.zip