Rename hush→dragonx across wallet codebase

- Rename RESOURCE_HUSHD/HUSH_CLI/HUSH_TX to RESOURCE_DRAGONXD/DRAGONX_CLI/DRAGONX_TX
- Remove unused .bat resource constants (DRAGONXD_BAT, DRAGONX_CLI_BAT)
- Update INCBIN symbols: g_hushd_exe → g_dragonxd_exe, etc.
- Update daemon search paths, removing hush-arrakis-chain fallbacks
- Update process detection (Windows findProcessByName, Linux /proc/comm, macOS pgrep)
- Update build.sh: embed dragonxd.exe/dragonx-cli.exe/dragonx-tx.exe
- Overhaul setup.sh: fix binary names, release paths, add -j passthrough
- Update getDaemonPath/needsDaemonExtraction/hasDaemonAvailable for new names

src/util/platform.h

@@ -118,8 +118,8 @@ public:
     static double getSelfMemoryUsageMB();
 
     /**
-     * @brief Get total RSS of all hushd daemon processes in megabytes
-     * Scans for any running hushd process by name, regardless of how it was launched.
+     * @brief Get total RSS of all dragonxd daemon processes in megabytes
+     * Scans for any running dragonxd process by name, regardless of how it was launched.
      * @return Combined daemon RSS in MB, or 0 if no daemon found
      */
     static double getDaemonMemoryUsageMB();