fix(mods): mark WaterMedia stack client — refuses dedicated server

watermedia throws IllegalEnvironmentException on server-side ("keep it
on client"). Its natives (wm_binaries) and dependents (watervision,
waterframes) are client-render media mods too — flip all four to client
so sync drops them.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

mods-sides.json

@@ -127,11 +127,11 @@
   "txnilib-neoforge-1.0.24-1.21.1.jar": "both",
   "utilitarian-1.21.1-0.19.2.jar": "both",
   "voicechat-neoforge-1.21.1-2.6.18.jar": "both",
-  "waterframes-NEOFORGE-mc1.21.1-v2.1.23.jar": "both",
-  "watermedia-2.1.37.jar": "both",
-  "watervision-NF-mc1.21.1-v0.1.0-alpha.jar": "both",
+  "waterframes-NEOFORGE-mc1.21.1-v2.1.23.jar": "client",
+  "watermedia-2.1.37.jar": "client",
+  "watervision-NF-mc1.21.1-v0.1.0-alpha.jar": "client",
   "welcomescreen-neoforge-1.0.0-1.21.1.jar": "client",
-  "wm_binaries-3.0.0-rc.1.jar": "both",
+  "wm_binaries-3.0.0-rc.1.jar": "client",
   "yeetusexperimentus-neoforge-87.0.0.jar": "client",
   "yet_another_config_lib_v3-3.8.2+1.21.1-neoforge.jar": "both"
 }