Plumtree sync (#393)

* wip plumtree

* sync works

* fix logging

* ttl to 0

* fix send packet to one peer

* spec

* wip GCS instead of bloom

* remove bloom filter remainders

* clean

* prune old announcements

* remove announcements from sync after LEAVE

* sync after 1 second

* pruning

* track own announcement and prune messages without announcements

* fix pruning

* getGcsMaxFilterBytes default value 400 bytes

* parameters

app/src/main/java/com/bitchat/android/mesh/BluetoothConnectionManager.kt

@@ -247,6 +247,19 @@ class BluetoothConnectionManager(
             serverManager.getCharacteristic()
         )
     }
+
+    /**
+     * Send a packet directly to a specific peer, without broadcasting to others.
+     */
+    fun sendPacketToPeer(peerID: String, packet: BitchatPacket): Boolean {
+        if (!isActive) return false
+        return packetBroadcaster.sendPacketToPeer(
+            RoutedPacket(packet),
+            peerID,
+            serverManager.getGattServer(),
+            serverManager.getCharacteristic()
+        )
+    }
     
 
     // Expose role controls for debug UI