Refactor to use LuaJIT and improve performance

Integrate LuaJIT as an optional runtime for better performance, with a fallback to standard Lua 5.4. Update Dockerfile to install LuaJIT and create a wrapper script for execution. Enhance network module with socket fallback support and update README to reflect these changes and configuration options.

scripts/utils.lua

@@ -15,4 +15,15 @@ function utils.getenv(name, def)
   return (v ~= nil and v ~= "") and v or def
 end
 
+-- Sleep function with fallback support for LuaJIT compatibility
+function utils.sleep(seconds)
+  -- Try to use socket.sleep if available, fallback to os.execute
+  local ok, socket = pcall(require, "socket")
+  if ok and socket and socket.sleep then
+    socket.sleep(seconds)
+  else
+    os.execute("sleep " .. tostring(seconds))
+  end
+end
+
 return utils