Refactor code structure and dependencies

package-lock.json

@@ -51,6 +51,7 @@
         "@types/node": "^20.3.1",
         "@types/passport-jwt": "^4.0.1",
         "@types/supertest": "^6.0.0",
+        "@types/ws": "^8.5.12",
         "@typescript-eslint/eslint-plugin": "^8.0.0",
         "@typescript-eslint/parser": "^8.0.0",
         "eslint": "9.11.1",
@@ -65,7 +66,8 @@
         "ts-loader": "^9.4.3",
         "ts-node": "^10.9.1",
         "tsconfig-paths": "^4.2.0",
-        "typescript": "^5.1.3"
+        "typescript": "^5.1.3",
+        "ws": "^8.18.0"
       }
     },
     "node_modules/@ampproject/remapping": {
@@ -4930,6 +4932,27 @@
       "integrity": "sha512-xNvxJEOUiWPGhUuUdQgAJPKOOJfGnIyKySOc09XkKsgdUV/3E2zvwZYdejjmRgPCgcym1juLH3226yA7sEFJKQ==",
       "license": "0BSD"
     },
+    "node_modules/@nestjs/graphql/node_modules/ws": {
+      "version": "8.17.1",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-8.17.1.tgz",
+      "integrity": "sha512-6XQFvXTkbfUOZOKKILFG1PDK2NDQs4azKQl26T0YS5CxqWLgXajbPZ+h4gZekJyRqFU8pvnbAbbs/3TgRPy+GQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=10.0.0"
+      },
+      "peerDependencies": {
+        "bufferutil": "^4.0.1",
+        "utf-8-validate": ">=5.0.2"
+      },
+      "peerDependenciesMeta": {
+        "bufferutil": {
+          "optional": true
+        },
+        "utf-8-validate": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/@nestjs/jwt": {
       "version": "10.2.0",
       "resolved": "https://registry.npmjs.org/@nestjs/jwt/-/jwt-10.2.0.tgz",
@@ -14846,9 +14869,9 @@
       "license": "ISC"
     },
     "node_modules/ws": {
-      "version": "8.17.1",
-      "resolved": "https://registry.npmjs.org/ws/-/ws-8.17.1.tgz",
-      "integrity": "sha512-6XQFvXTkbfUOZOKKILFG1PDK2NDQs4azKQl26T0YS5CxqWLgXajbPZ+h4gZekJyRqFU8pvnbAbbs/3TgRPy+GQ==",
+      "version": "8.18.0",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-8.18.0.tgz",
+      "integrity": "sha512-8VbfWfHLbbwu3+N6OKsOMpBdT4kXPDDB9cJk2bJ6mh9ucxdlnNvH1e+roYkKmN9Nxw2yjz7VzeO9oOz2zJ04Pw==",
       "license": "MIT",
       "engines": {
         "node": ">=10.0.0"