fix: geoMatch loadFrames crash when GEO_DATA_DIR missing on new server

- Add fs.existsSync check before readdirSync in loadFrames()
- Add warning logs when GEO_DATA_DIR, drone CSV, or building/ dir not found
- Remove dead csvPath variable (unused)
- Add warning log in loadPois() when building/ dir missing

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

server/src/services/geoMatch.ts

@@ -276,15 +276,19 @@ function loadFrames(): DroneFrame[] {
   if (_frames) return _frames;
   if (!_dataDir) return [];
 
-  const csvPath = fs.readdirSync(_dataDir)
-    .find(f => f.endsWith('.csv') && !fs.statSync(path.join(_dataDir!, f)).isDirectory()
-      && !path.join(_dataDir!, f).includes('building'));
+  if (!fs.existsSync(_dataDir)) {
+    console.warn(`[geo] GEO_DATA_DIR not found: ${_dataDir}. Set GEO_DATA_DIR env var.`);
+    return [];
+  }
 
   // 드론 CSV는 data dir 바로 아래 (building 폴더 제외)
   const files = fs.readdirSync(_dataDir).filter(f =>
     f.endsWith('.csv') && f.includes('회덕') && !f.includes('POI') && !f.includes('측점')
   );
-  if (!files.length) return [];
+  if (!files.length) {
+    console.warn(`[geo] No drone CSV (containing '회덕') found in: ${_dataDir}`);
+    return [];
+  }
 
   const rows = readCsvUtf8(path.join(_dataDir, files[0]));
   const header = rows[0].map(h => h.trim().replace(/^\uFEFF/, ''));
@@ -309,7 +313,10 @@ function loadPois(): GeoPoint[] {
   if (!_dataDir) return [];
 
   const buildingDir = path.join(_dataDir, 'building');
-  if (!fs.existsSync(buildingDir)) return [];
+  if (!fs.existsSync(buildingDir)) {
+    console.warn(`[geo] building/ dir not found: ${buildingDir}`);
+    return [];
+  }
 
   const result: GeoPoint[] = [];