Add comprehensive caching for performance optimization

- Cache predicted rating calculations (24 hour duration)
- Cache rating history data to avoid repeated scraping
- Implement separate cache keys for different data types
- Add cache hit logging for monitoring effectiveness
- Update PDGA numbers list with additional players
- Significantly improve performance for repeat visitors
- Reduce load on PDGA servers with intelligent caching

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

server.js

@@ -511,11 +511,29 @@ function parseRatingHistory(html) {
 app.get('/api/rating-history/:pdgaNumber', async (req, res) => {
   try {
     const { pdgaNumber } = req.params;
-    console.log(`Fetching rating history for PDGA ${pdgaNumber}...`);
+    const cacheKey = `history-${pdgaNumber}`;
+    const cached = cache.get(cacheKey);
     
+    // Check cache first (24 hour cache for rating history)
+    if (cached && Date.now() - cached.timestamp < CACHE_DURATION) {
+      console.log(`Using cached rating history for PDGA ${pdgaNumber}`);
+      res.json({ 
+        pdgaNumber: parseInt(pdgaNumber),
+        history: cached.data
+      });
+      return;
+    }
+    
+    console.log(`Fetching rating history for PDGA ${pdgaNumber}...`);
     const html = await fetchRatingHistory(pdgaNumber);
     const history = parseRatingHistory(html);
     
+    // Cache the result
+    cache.set(cacheKey, {
+      data: history,
+      timestamp: Date.now()
+    });
+    
     res.json({ 
       pdgaNumber: parseInt(pdgaNumber),
       history 
@@ -530,6 +548,19 @@ app.post('/api/predicted-rating/:pdgaNumber', async (req, res) => {
   let browser = null;
   try {
     const { pdgaNumber } = req.params;
+    const cacheKey = `predicted-${pdgaNumber}`;
+    const cached = cache.get(cacheKey);
+    
+    // Check cache first (24 hour cache for predicted ratings)
+    if (cached && Date.now() - cached.timestamp < CACHE_DURATION) {
+      console.log(`Using cached predicted rating for PDGA ${pdgaNumber}`);
+      res.json({ 
+        pdgaNumber: parseInt(pdgaNumber),
+        predictedRating: cached.data
+      });
+      return;
+    }
+    
     browser = await puppeteer.launch({ 
       headless: "new",
       args: [
@@ -549,6 +580,12 @@ app.post('/api/predicted-rating/:pdgaNumber', async (req, res) => {
     await browser.close();
     browser = null;
     
+    // Cache the result
+    cache.set(cacheKey, {
+      data: predictedRating,
+      timestamp: Date.now()
+    });
+    
     res.json({ 
       pdgaNumber: parseInt(pdgaNumber),
       predictedRating