Fix: implement case-insensitive file matching for broadcast audio sequences to fix missing uppercase line and station names

CloudServer/server.js

@@ -1235,6 +1235,14 @@ function getOrCreateHlsStreamState(streamName) {
     return hlsStreams[streamName];
 }
 
+function findFileCaseInsensitive(dir, filename) {
+    if (!fs.existsSync(dir)) return null;
+    const files = fs.readdirSync(dir);
+    const lowerFilename = filename.toLowerCase();
+    const match = files.find(f => f.toLowerCase() === lowerFilename);
+    return match ? path.join(dir, match) : null;
+}
+
 function resolveSequenceFiles(seq) {
     ensureSilenceWav();
     const files = [];
@@ -1245,14 +1253,19 @@ function resolveSequenceFiles(seq) {
             continue;
         }
 
-        const candidates = [
-            path.join(audioStationDir, `${item}.wav`),
-            path.join(audioLineDir, `${item}.wav`),
-            path.join(audioVoiceDir, `${item}.wav`),
-            ...getBeepAudioDirs().map(dir => path.join(dir, `${item}.wav`))
+        const dirsToSearch = [
+            audioStationDir,
+            audioLineDir,
+            audioVoiceDir,
+            ...getBeepAudioDirs()
         ];
 
-        const found = candidates.find(p => fs.existsSync(p));
+        let found = null;
+        for (const dir of dirsToSearch) {
+            found = findFileCaseInsensitive(dir, `${item}.wav`);
+            if (found) break;
+        }
+
         if (found) {
             files.push(found);
         } else {