Add integrated Palladium node and automate RPC credentials

- Integrate Palladium node (palladiumd) in separate Docker container
- Add automatic RPC credential detection from palladium.conf
- Eliminate manual credential synchronization between files

.gitignore

@@ -1,7 +1,11 @@
-# ElectrumX data directory
-/data/
+# ElectrumX server data
+/electrumx-data/
 
-# Docker volumes and logs
+# Palladium node data (keep only the config file)
+/palladium-node-data/*
+!/palladium-node-data/palladium.conf
+
+# Logs
 *.log
 
 # IDE and editor files