feat: use DragonX DNS seed nodes, pass -maxconnections to daemon, show sync speed

- Replace hardcoded IP addnodes with node.dragonx.is, node1–4.dragonx.is
  in both daemon launch params and auto-generated DRAGONX.conf
- Add max_connections setting (persisted, default 0 = daemon default);
  passed as -maxconnections= flag to dragonxd on startup
- Show blocks/sec in status bar during sync with exponential smoothing
  (e.g. "Syncing 45.2% (12340 left, 85 blk/s)")

src/daemon/embedded_daemon.cpp

@@ -205,7 +205,11 @@ std::vector<std::string> EmbeddedDaemon::getChainParams()
         "-ac_reward=300000000",
         "-ac_blocktime=36",
         "-ac_private=1",
-        "-addnode=176.126.87.241",
+        "-addnode=node.dragonx.is",
+        "-addnode=node1.dragonx.is",
+        "-addnode=node2.dragonx.is",
+        "-addnode=node3.dragonx.is",
+        "-addnode=node4.dragonx.is",
         "-experimentalfeatures",
         "-developerencryptwallet",
         dbcache_arg
@@ -473,6 +477,11 @@ bool EmbeddedDaemon::start(const std::string& binary_path)
         args.push_back("-debug=" + cat);
     }
 
+    // Append max connections if configured (0 = daemon default)
+    if (max_connections_ > 0) {
+        args.push_back("-maxconnections=" + std::to_string(max_connections_));
+    }
+
     // Add -rescan flag if requested (one-shot)
     if (rescan_on_next_start_.exchange(false)) {
         DEBUG_LOGF("[INFO] Adding -rescan flag for blockchain rescan\n");