feat(games): accept full Steam store URL in create()

Allow callers to pass either a raw Steam app ID or a full store URL (e.g. https://store.steampowered.com/app/730/...) in req.body.steamId.

In create() in controllers/games.js:

- normalize input into a local steamId variable: if the value includes store.steampowered.com, extract the numeric ID via match(/\d+/)[0], otherwise use the value as-is

- use the normalized steamId for both duplicate checks: user-scoped lookup (steamId + accessedBy.user) and global lookup

This lets users paste a copied store link directly without manually stripping the app ID, while keeping existing raw-ID behavior unchanged.

controllers/games.js

@@ -77,6 +77,11 @@ export const show = asyncHandler(async (req, res, next) => {
  */
 export const create = asyncHandler(async (req, res, next) => {
   let oldGame;
+  let steamId;
+
+  if (req.body.steamId.includes("store.steampowered.com"))
+    steamId = req.body.steamId.match(/\d+/)[0];
+  else steamId = req.body.steamId;
 
   if (req.body.shortDesc && isValid(req.body.shortDesc))
     req.body.shortDesc = decode(req.body.shortDesc);
@@ -115,9 +120,9 @@ export const create = asyncHandler(async (req, res, next) => {
       ))
     : "";
 
-  req.body.steamId.length > 0
+  steamId.length > 0
     ? (oldGame = await Game.findOne({
-        steamId: req.body.steamId,
+        steamId: steamId,
         "accessedBy.user": req.user.id,
       }))
     : (oldGame = await Game.findOne({
@@ -133,8 +138,8 @@ export const create = asyncHandler(async (req, res, next) => {
       ),
     );
 
-  req.body.steamId.length > 0
-    ? (oldGame = await Game.findOne({ steamId: req.body.steamId }))
+  steamId.length > 0
+    ? (oldGame = await Game.findOne({ steamId: steamId }))
     : (oldGame = await Game.findOne({ title: req.body.title }));
 
   if (oldGame) {