chore: add copyright notices to each file

Some people accidentally, mistakenly, and without any malicious intent forget to attribute code from this resource to its source. This change will hopefully assist people, so that they do not make that mistake again.

imports/getClosestVehicle/shared.lua

@@ -1,3 +1,11 @@
+--[[
+    https://github.com/overextended/ox_lib
+
+    This file is licensed under LGPL-3.0 or higher <https://www.gnu.org/licenses/lgpl-3.0.en.html>
+
+    Copyright (c) 2025 Linden <https://github.com/thelindat/fivem>
+]]
+
 ---@param coords vector3 The coords to check from.
 ---@param maxDistance? number The max distance to check.
 ---@param includePlayerVehicle? boolean Whether or not to include the player's current vehicle. Ignored on the server.