Geohash-specific relays (#306)

* per-relay-chat

* normalize relay URL

* turn off default relays

* add relay list

* fetch relay list from the internet

app/src/main/java/com/bitchat/android/BitchatApplication.kt

@@ -1,6 +1,7 @@
 package com.bitchat.android
 
 import android.app.Application
+import com.bitchat.android.nostr.RelayDirectory
 
 /**
  * Main application class for bitchat Android
@@ -10,7 +11,7 @@ class BitchatApplication : Application() {
     override fun onCreate() {
         super.onCreate()
         
-        // Initialize any global services or configurations
-        // For now, keep it simple
+        // Initialize relay directory (loads assets/nostr_relays.csv)
+        RelayDirectory.initialize(this)
     }
 }