feat: Fetch and parse METARs from metars.txt into memory

Co-authored-by: aider (gemini/gemini-2.5-pro) <aider@aider.chat>

metar.html

@@ -14,10 +14,23 @@
 
     </div>
     <script>
+        const metars = [];
 
-
+        fetch('metars.txt')
-
+            .then(response => response.text())
-
+            .then(data => {
+                const lines = data.split('\n');
+                lines.forEach(line => {
+                    if (line.includes('METAR')) {
+                        const metarString = line.substring(line.indexOf('METAR') + 6).replace('=', '').trim();
+                        if (metarString) {
+                            metars.push(metarString);
+                        }
+                    }
+                });
+                console.log(`Loaded ${metars.length} METARs.`);
+            })
+            .catch(error => console.error('Error fetching or parsing metars.txt:', error));
     </script>
 </body>
 </html>