chore: retire les fichiers et l'outillage hérités de la librairie

- Configs cassées sous Svelte 5 : eslint (eslint-plugin-svelte3), prettier
  (plugin v2), leurs scripts lint/format et dépendances associées
- Fichiers sans usage : .npmrc, .vscode/, .github/ (vide), CHANGELOG.md
  de la librairie, .eslintcache
- Player.svelte (composant headless) conservé : c'est le moteur de
  radio-player.svelte — check 0/0, build vert

package.json

@@ -11,10 +11,6 @@
 		"sync": "svelte-kit sync",
 		"check": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json",
 		"check:watch": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json --watch",
-		"lint:prettier": "prettier --check --plugin-search-dir=. .",
-		"lint:eslint": "TIMING=1 eslint . --ext .ts,.tsx,.svelte --cache",
-		"lint": "yarn lint:prettier && yarn lint:eslint",
-		"format": "prettier --write --plugin-search-dir=. .",
 		"ts": "tsc --pretty --noImplicitAny --noEmit"
 	},
 	"dependencies": {
@@ -31,18 +27,9 @@
 		"@sveltejs/vite-plugin-svelte": "^5",
 		"@tailwindcss/forms": "^0.5.3",
 		"@tailwindcss/typography": "^0.5.9",
-		"@typescript-eslint/eslint-plugin": "^5.61.0",
-		"@typescript-eslint/parser": "^5.61.0",
 		"autoprefixer": "^10.4.14",
-		"eslint": "^8.44.0",
-		"eslint-config-prettier": "^8.8.0",
-		"eslint-plugin-svelte3": "^4.0.0",
-		"eslint-plugin-unused-imports": "^2.0.0",
 		"postcss": "^8.4.25",
 		"postcss-load-config": "^4.0.1",
-		"prettier": "^2.8.8",
-		"prettier-plugin-svelte": "^2.10.1",
-		"prettier-plugin-tailwindcss": "^0.3.0",
 		"svelte": "^5",
 		"svelte-check": "^4",
 		"tailwindcss": "^3.3.2",