Release v1.4.16 with crash prevention and hang protection

- Add 30s fetch timeouts to ALL API calls (Real-Debrid, BestDebrid, AllDebrid, Mega-Web)
- Fix race condition in concurrent worker indexing (runWithConcurrency)
- Guard JSON.parse in RealDebrid response with try-catch
- Add try-catch to fs.mkdirSync in download pipeline (handles permission denied)
- Convert MD5/SHA1 hashing to streaming (prevents OOM on large files)
- Add error handling for hash manifest file reading
- Prevent infinite hangs on unresponsive API endpoints

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

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "real-debrid-downloader",
-  "version": "1.4.15",
+  "version": "1.4.16",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "real-debrid-downloader",
-      "version": "1.4.15",
+      "version": "1.4.16",
       "license": "MIT",
       "dependencies": {
         "adm-zip": "^0.5.16",