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/rpc/connection.cpp

@@ -63,7 +63,7 @@ std::string Connection::getDefaultConfPath()
 std::string Connection::getSaplingParamsDir()
 {
     // Sapling params are now extracted alongside the daemon binaries
-    // in <ObsidianDragonDir>/hush3/ — no longer in the legacy ZcashParams dir.
+    // in <ObsidianDragonDir>/dragonx/ — no longer in the legacy ZcashParams dir.
     return resources::getDaemonDirectory();
 }