fix: Remove BOM from railway.json

Fixed Railway deployment error:
'invalid character ï looking for beginning of value'

Cause: UTF-8 BOM (Byte Order Mark) at file start
Solution: Recreated file with UTF-8 without BOM
Railway JSON parser now reads correctly

railway.json

@@ -1,4 +1,4 @@
-{
+{
   "$schema": "https://railway.app/railway.schema.json",
   "build": {
     "builder": "NIXPACKS",
@@ -10,4 +10,4 @@
     "restartPolicyMaxRetries": 10,
     "startCommand": "npm start"
   }
-}
+}