Revert "Mesh gossip (#381)" (#394)

This reverts commit 0969c0641e.

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

@@ -65,35 +65,9 @@ class PacketRelayManager(private val myPeerID: String) {
         val relayPacket = packet.copy(ttl = (packet.ttl - 1u).toUByte())
         Log.d(TAG, "Decremented TTL from ${'$'}{packet.ttl} to ${'$'}{relayPacket.ttl}")
         
-        // Source-based routing: if route is set and includes us, try targeted next-hop forwarding
-        val route = relayPacket.route
-        if (!route.isNullOrEmpty()) {
-            val myIdBytes = hexStringToPeerBytes(myPeerID)
-            val index = route.indexOfFirst { it.contentEquals(myIdBytes) }
-            if (index >= 0) {
-                val nextHopIdHex: String? = run {
-                    val nextIndex = index + 1
-                    if (nextIndex < route.size) {
-                        route[nextIndex].toHexString()
-                    } else {
-                        // We are the last intermediate; try final recipient as next hop
-                        relayPacket.recipientID?.toHexString()
-                    }
-                }
-                if (nextHopIdHex != null) {
-                    val success = try { delegate?.sendToPeer(nextHopIdHex, RoutedPacket(relayPacket, peerID, routed.relayAddress)) } catch (_: Exception) { false } ?: false
-                    if (success) {
-                        Log.i(TAG, "📦 Source-route relay: ${myPeerID.take(8)} -> ${nextHopIdHex.take(8)} (type ${'$'}{packet.type}, TTL ${'$'}{relayPacket.ttl})")
-                        return
-                    } else {
-                        Log.w(TAG, "Source-route next hop ${nextHopIdHex.take(8)} not directly connected; falling back to broadcast")
-                    }
-                }
-            }
-        }
-
         // Apply relay logic based on packet type and debug switch
         val shouldRelay = isRelayEnabled() && shouldRelayPacket(relayPacket, peerID)
+        
         if (shouldRelay) {
             relayPacket(RoutedPacket(relayPacket, peerID, routed.relayAddress))
         } else {
@@ -232,17 +206,4 @@ interface PacketRelayManagerDelegate {
     
     // Packet operations
     fun broadcastPacket(routed: RoutedPacket)
-    fun sendToPeer(peerID: String, routed: RoutedPacket): Boolean
-}
-
-private fun hexStringToPeerBytes(hex: String): ByteArray {
-    val result = ByteArray(8)
-    var idx = 0
-    var out = 0
-    while (idx + 1 < hex.length && out < 8) {
-        val b = hex.substring(idx, idx + 2).toIntOrNull(16)?.toByte() ?: 0
-        result[out++] = b
-        idx += 2
-    }
-    return result
 }