feat(nostr): Add mesh-to-relay gateway for #me messages

app/build.gradle.kts

@@ -138,6 +138,9 @@ dependencies {
     // EXIF orientation handling for images
     implementation("androidx.exifinterface:exifinterface:1.3.7")
 
+    // Async image loading from URLs (Coil)
+    implementation(libs.coil.compose)
+
     // Testing
     testImplementation(libs.bundles.testing)
     androidTestImplementation(platform(libs.androidx.compose.bom))

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

@@ -714,6 +714,18 @@ class BluetoothMeshService(private val context: Context) {
         }
     }
 
+    /**
+     * Broadcast a pre-built BitchatPacket (signs it before sending).
+     * Used by NostrProfileManager for mesh fallback when relays are unavailable.
+     */
+    fun broadcastPacket(packet: BitchatPacket) {
+        serviceScope.launch {
+            val signedPacket = signPacketBeforeBroadcast(packet)
+            connectionManager.broadcastPacket(RoutedPacket(signedPacket))
+            try { gossipSyncManager.onPublicPacketSeen(signedPacket) } catch (_: Exception) { }
+        }
+    }
+
     /**
      * Send a file over mesh as a broadcast MESSAGE (public mesh timeline/channels).
      */

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

@@ -383,6 +383,18 @@ class MessageHandler(private val myPeerID: String, private val appContext: andro
         val packet = routed.packet
         val peerID = routed.peerID ?: "unknown"
 
+        // Check if this is a Nostr relay request packet (should be forwarded to relays, not displayed)
+        if (packet.payload.isNotEmpty()) {
+            val header = packet.payload[0]
+            if (header == com.bitchat.android.nostr.NostrMeshSerializer.TYPE_NOSTR_RELAY_REQUEST ||
+                header == com.bitchat.android.nostr.NostrMeshSerializer.TYPE_NOSTR_PLAINTEXT) {
+                Log.d(TAG, "📡 Received Nostr relay request via mesh from ${peerID.take(8)}, routing to gateway")
+                // Route to NostrMeshGateway for relay publishing (if we have internet)
+                com.bitchat.android.nostr.NostrMeshGateway.meshPacketReceived(appContext, packet.payload, null)
+                return  // Don't display Nostr relay packets as chat messages
+            }
+        }
+
         // Enforce: only accept public messages from verified peers we know
         val peerInfo = delegate?.getPeerInfo(peerID)
         if (peerInfo == null || !peerInfo.isVerifiedNickname) {

app/src/main/java/com/bitchat/android/nostr/NostrFilter.kt

@@ -73,6 +73,17 @@ data class NostrFilter(
         fun forEvents(ids: List<String>): NostrFilter {
             return NostrFilter(ids = ids)
         }
+
+        /**
+         * Create filter for user metadata (kind 0) - profile information
+         */
+        fun profileMetadata(pubkey: String): NostrFilter {
+            return NostrFilter(
+                kinds = listOf(NostrKind.METADATA),
+                authors = listOf(pubkey),
+                limit = 1
+            )
+        }
     }
 
     /**