feat: Implement Request Sync Manager (V2 Sync) (#965)

* feat: Implement Request Sync Manager (V2 Sync)

- Add RequestSyncManager to track and attribute sync requests
- Update BitchatPacket and BinaryProtocol to support IS_RSR flag (0x10)
- Update RequestSyncPacket with new TLV fields (sinceTimestamp, fragmentIdFilter)
- Update GossipSyncManager to use unicast sync requests and mark responses as RSR
- Update BLEService to enforce timestamp validation for normal packets and exempt valid RSRs
- Add documentation for the new sync manager mechanism

* fix: Resolve compilation errors in V2 Sync implementation

- Remove duplicate restartGossipManager in BLEService
- Add missing TransportConfig constants for sync
- Add 'sync' log category to BitLogger
- Add missing BitLogger import in GossipSyncManager

* fix: Update tests for V2 Sync changes

- Add requestSyncManager parameter to GossipSyncManager init in tests
- Implement getConnectedPeers stub in RecordingDelegate
- Remove unused variable warning in SubscriptionRateLimitTests

---------

Co-authored-by: a1denvalu3 <>
Co-authored-by: jack <212554440+jackjackbits@users.noreply.github.com>

bitchat/Models/BitchatPacket.swift

@@ -22,8 +22,9 @@ struct BitchatPacket: Codable {
     var signature: Data?
     var ttl: UInt8
     var route: [Data]?
+    var isRSR: Bool
     
-    init(type: UInt8, senderID: Data, recipientID: Data?, timestamp: UInt64, payload: Data, signature: Data?, ttl: UInt8, version: UInt8 = 1, route: [Data]? = nil) {
+    init(type: UInt8, senderID: Data, recipientID: Data?, timestamp: UInt64, payload: Data, signature: Data?, ttl: UInt8, version: UInt8 = 1, route: [Data]? = nil, isRSR: Bool = false) {
         self.version = version
         self.type = type
         self.senderID = senderID
@@ -33,10 +34,11 @@ struct BitchatPacket: Codable {
         self.signature = signature
         self.ttl = ttl
         self.route = route
+        self.isRSR = isRSR
     }
     
     // Convenience initializer for new binary format
-    init(type: UInt8, ttl: UInt8, senderID: PeerID, payload: Data) {
+    init(type: UInt8, ttl: UInt8, senderID: PeerID, payload: Data, isRSR: Bool = false) {
         self.version = 1
         self.type = type
         // Convert hex string peer ID to binary data (8 bytes)
@@ -56,6 +58,7 @@ struct BitchatPacket: Codable {
         self.signature = nil
         self.ttl = ttl
         self.route = nil
+        self.isRSR = isRSR
     }
     
     var data: Data? {
@@ -85,7 +88,8 @@ struct BitchatPacket: Codable {
             signature: nil, // Remove signature for signing
             ttl: 0, // Use fixed TTL=0 for signing to ensure relay compatibility
             version: version,
-            route: route
+            route: route,
+            isRSR: false // RSR flag is mutable and not part of the signature
         )
         return BinaryProtocol.encode(unsignedPacket)
     }