security: move secrets to .env, never commit secrets to git

package-lock.json

@@ -9,6 +9,7 @@
       "version": "1.0.0",
       "license": "ISC",
       "dependencies": {
+        "dotenv": "^17.3.1",
         "express": "^5.2.1",
         "uuid": "^13.0.0",
         "ws": "^8.19.0"
@@ -155,6 +156,18 @@
         "node": ">= 0.8"
       }
     },
+    "node_modules/dotenv": {
+      "version": "17.3.1",
+      "resolved": "https://registry.npmjs.org/dotenv/-/dotenv-17.3.1.tgz",
+      "integrity": "sha512-IO8C/dzEb6O3F9/twg6ZLXz164a2fhTnEWb95H23Dm4OuN+92NmEAlTrupP9VW6Jm3sO26tQlqyvyi4CsnY9GA==",
+      "license": "BSD-2-Clause",
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://dotenvx.com"
+      }
+    },
     "node_modules/dunder-proto": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/dunder-proto/-/dunder-proto-1.0.1.tgz",