refactor: ts3gotify to standalone module

package.json

@@ -1,9 +1,9 @@
 {
   "scripts": {
-    "build": "bun build --minify --target bun --outdir dist --sourcemap src/app.ts",
+    "build": "bun build --minify --target bun --outdir dist --sourcemap src/main.ts",
     "check:code": "eslint src/ --ext .ts",
     "check:spell": "cspell --config cspell.code.json **/*.ts",
-    "start": "bun run src/app.ts"
+    "start": "bun run src/main.ts"
   },
   "devDependencies": {
     "@types/ts3-nodejs-library": "^2.0.1",
@@ -22,6 +22,6 @@
     "ts3-nodejs-library": "^3.4.1"
   },
   "name": "ts3gotify",
-  "module": "src/app.ts",
+  "module": "src/main.ts",
   "type": "module"
 }