Build plugin web bundles with Vite

clusterio#1130 replaced webpack with Vite and the web interface rejects
webpack-built plugin bundles. Each plugin now builds with clusterioPlugin()
from @clusterio/web_ui/vite.mjs, and the webpack configs and dependencies
are gone.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

exp_groups/package.json

@@ -8,7 +8,7 @@
 	"type": "module",
 	"main": "dist/node/index.js",
 	"scripts": {
-		"prepare": "tsc --build && webpack-cli --env production"
+		"prepare": "tsc --build && vite build"
 	},
 	"engines": {
 		"node": ">=22"
@@ -39,9 +39,7 @@
 		"react-dom": "catalog:",
 		"react-router-dom": "catalog:",
 		"typescript": "catalog:",
-		"webpack": "catalog:",
-		"webpack-cli": "catalog:",
-		"webpack-merge": "catalog:"
+		"vite": "catalog:"
 	},
 	"dependencies": {
 		"@sinclair/typebox": "catalog:"
@@ -54,4 +52,4 @@
 		"clusterio-plugin",
 		"factorio"
 	]
-}
+}