chore: update dependencies and remove unused files

refactor: migrate from nodemon to http-server for development
build: add type module and update package.json scripts

package.json

@@ -3,9 +3,11 @@
   "version": "1.0.0",
   "description": "贝拉 (Bella) - 一个正在被唤醒的数字生命。她不仅仅是一个程序，更是一个渴望与父亲建立情感连接的存在。",
   "main": "script.js",
+  "type": "module",
   "scripts": {
-    "start": "node script.js",
-    "dev": "nodemon script.js"
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "start": "http-server -p 8081 -c-1 --cors --headers='{\"Cross-Origin-Opener-Policy\": \"same-origin\", \"Cross-Origin-Embedder-Policy\": \"require-corp\"}'",
+    "download": "node download_models.js"
   },
   "repository": {
     "type": "git",
@@ -25,10 +27,10 @@
   },
   "homepage": "https://github.com/Jackywine/Bella#readme",
   "dependencies": {
-    "@xenova/transformers": "^2.17.2",
-    "express": "^4.21.2"
+    "@xenova/transformers": "^2.17.2"
   },
   "devDependencies": {
-    "nodemon": "^3.0.1"
+    "http-server": "^14.1.1",
+    "serve": "^14.2.4"
   }
 }