chore: Goodbye gulp (#11447)

* Add a script for building assets

* Replace with script executions

* Remove gulp dependencies

* Fix dependencies

---------

Co-authored-by: Acid Chicken (硫酸鶏) <root@acid-chicken.com>
Co-authored-by: syuilo <Syuilotan@yahoo.co.jp>

package.json

@@ -15,15 +15,15 @@
 	"private": true,
 	"scripts": {
 		"build-pre": "node ./scripts/build-pre.js",
-		"build": "pnpm build-pre && pnpm -r build && pnpm gulp",
+		"build-assets": "node ./scripts/build-assets.mjs",
+		"build": "pnpm build-pre && pnpm -r build && pnpm build-assets",
 		"build-storybook": "pnpm --filter frontend build-storybook",
 		"start": "pnpm check:connect && cd packages/backend && node ./built/boot/index.js",
 		"start:test": "cd packages/backend && cross-env NODE_ENV=test node ./built/boot/index.js",
 		"init": "pnpm migrate",
 		"migrate": "cd packages/backend && pnpm migrate",
 		"check:connect": "cd packages/backend && pnpm check:connect",
 		"migrateandstart": "pnpm migrate && pnpm start",
-		"gulp": "pnpm exec gulp build",
 		"watch": "pnpm dev",
 		"dev": "node ./scripts/dev.mjs",
 		"lint": "pnpm -r lint",
@@ -34,7 +34,6 @@
 		"jest-and-coverage": "cd packages/backend && pnpm jest-and-coverage",
 		"test": "pnpm -r test",
 		"test-and-coverage": "pnpm -r test-and-coverage",
-		"format": "pnpm exec gulp format",
 		"clean": "node ./scripts/clean.js",
 		"clean-all": "node ./scripts/clean-all.js",
 		"cleanall": "pnpm clean-all"
@@ -45,17 +44,13 @@
 	},
 	"dependencies": {
 		"execa": "8.0.1",
-		"gulp": "4.0.2",
-		"gulp-cssnano": "2.1.3",
-		"gulp-rename": "2.0.0",
-		"gulp-replace": "1.1.4",
-		"gulp-terser": "2.1.0",
+		"cssnano": "6.0.1",
 		"js-yaml": "4.1.0",
+		"postcss": "8.4.27",
+		"terser": "5.19.2",
 		"typescript": "5.2.2"
 	},
 	"devDependencies": {
-		"@types/gulp": "4.0.13",
-		"@types/gulp-rename": "2.0.2",
 		"@typescript-eslint/eslint-plugin": "6.6.0",
 		"@typescript-eslint/parser": "6.6.0",
 		"cross-env": "7.0.3",

packages/frontend/package.json

@@ -98,8 +98,6 @@
 		"@testing-library/vue": "7.0.0",
 		"@types/escape-regexp": "0.0.1",
 		"@types/estree": "1.0.1",
-		"@types/gulp": "4.0.13",
-		"@types/gulp-rename": "2.0.2",
 		"@types/matter-js": "0.19.0",
 		"@types/micromatch": "4.0.2",
 		"@types/node": "20.5.9",