chore(mods): classify fusion (client) + rechiseled (both)

Two new distribution mods. rechiseled adds decorative blocks → both
(server needs the block registry). fusion is a client-only resource-pack
texture/model feature (no blocks/logic) → client, so sync drops it from
server-mods.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

mods-sides.json

@@ -93,6 +93,7 @@
   "ftb-teams-neoforge-2101.1.10.jar": "both",
   "ftb-ultimine-neoforge-2101.1.14.jar": "both",
   "functionalstorage-1.21.1-1.5.7.jar": "both",
+  "fusion-1.3.2a-neoforge-mc1.21.1.jar": "client",
   "fzzy_config-0.7.6+1.21+neoforge.jar": "both",
   "geckolib-neoforge-1.21.1-4.8.4.jar": "both",
   "handcrafted-neoforge-1.21.1-4.0.3.jar": "both",
@@ -119,6 +120,7 @@
   "moreoverlays-1.24.2-mc1.21.1-neoforge.jar": "client",
   "polymorph-neoforge-1.1.0+1.21.1.jar": "both",
   "ponderjs-neoforge-1.21.1-2.4.0.jar": "client",
+  "rechiseled-1.2.5-neoforge-mc1.21.11.jar": "both",
   "resourcefullib-neoforge-1.21-3.0.12.jar": "both",
   "rhino-2101.2.7-build.85.jar": "both",
   "rightclickharvest-neoforge-4.6.1+1.21.1.jar": "both",