⚙️ Improve OAuth token handling with enhanced logging and configuration usage

code/websites/pokedex.online/server/oauth-proxy.js

@@ -42,7 +42,8 @@ app.use('/api/gamemaster', gamemasterRouter);
  * POST /oauth/token
  */
 app.post('/oauth/token', async (req, res) => {
-  if (!hasChallongeAuth) {
+  if (!config.challonge.configured) {
+    logger.warn('OAuth token request received but Challonge not configured');
     return res.status(503).json({
       error: 'Challonge OAuth not configured',
       message:
@@ -53,10 +54,12 @@ app.post('/oauth/token', async (req, res) => {
   const { code } = req.body;
 
   if (!code) {
+    logger.warn('OAuth token request missing authorization code');
     return res.status(400).json({ error: 'Missing authorization code' });
   }
 
   try {
+    logger.debug('Exchanging authorization code for access token');
     const response = await fetch('https://api.challonge.com/oauth/token', {
       method: 'POST',
       headers: {
@@ -64,24 +67,24 @@ app.post('/oauth/token', async (req, res) => {
       },
       body: new URLSearchParams({
         grant_type: 'authorization_code',
-        client_id: CLIENT_ID,
-        client_secret: CLIENT_SECRET,
+        client_id: config.challonge.clientId,
+        client_secret: config.challonge.clientSecret,
         code: code,
-        redirect_uri: REDIRECT_URI
+        redirect_uri: config.challonge.redirectUri
       })
     });
 
     const data = await response.json();
 
     if (!response.ok) {
-      console.error('Token exchange failed:', data);
+      logger.error('Token exchange failed', { status: response.status, data });
       return res.status(response.status).json(data);
     }
 
-    console.log('✅ Token exchange successful');
+    logger.info('Token exchange successful');
     res.json(data);
   } catch (error) {
-    console.error('Token exchange error:', error);
+    logger.error('Token exchange error', { error: error.message });
     res.status(500).json({
       error: 'Token exchange failed',
       message: error.message