fix(torrent): resolve TUN proxy stalls with DHT bootstrap and UDP translation matching

- Bundle updated aria2c binary with TUN/Fake-IP address translation matching and default DHT bootstrap nodes
- Fallback to 32-bit transaction ID correlation for UDP tracker replies and DHT messages when upstream rewrites return IP
- Cache UDP tracker connection IDs for both rewritten and original addresses to unblock pending announces
- Default to public DHT bootstrap routers on startup to eliminate zero-node routing table starvation
- Update engines.lock.json checksum for the staged aarch64-apple-darwin aria2c sidecar

engines.lock.json

@@ -19,7 +19,7 @@
             "networkTargetPolicy": "firelink-v1",
             "networkTargetPolicyDigest": "sha256:064503d30f1a043e79113f7e44ddfb517fbf2c578a332896355180743eaf1705"
           },
-          "sha256": "913ddf47f1194f5f22c69f8b5179bbeb48ebf1cf73c62a8d385b05f8dd521614"
+          "sha256": "b6e51125007860e1a58c75737faa2cd0d1d5372c1c9ca82d1bf87d2c40081aac"
         },
         "ffmpeg": {
           "version": "N-126314-g3386acd2f9",