feat(capture): record whole packets of an account, a character or everything on every server

Staff arm a packet capture on the dashboard; master passes MESSAGE_CAPTURE_CONTROL ARM to
every world, auth and chat and arms its own. Each server's PacketCapture tap (dServer receive,
and a send hook in RakPeer::Send so replica constructions are seen too) records into one
preallocated chunk per server and ships sealed chunks through master on the main loop when
capture_flush_bytes or capture_flush_interval_ms is reached; past capture_buffer_max_mb the
oldest chunks are dropped and the dashboard records a gap. Nothing is armed: one flag check.

- targets: an account (from its login; packets before the login are kept per connection
  and added once auth or the world knows whose they are), a character (from when it is
  picked), or everything; up to 8 at once (a bit each in the record mask)
- worlds and auth record their clients' packets and the master link messages of a captured
  player (session keys by name, zone transfers by request, player added/removed, migration);
  chat finds the player in each packet; master records server traffic for everything
- secrets are never recorded: structs that carry them (login request, login response user
  key, world validation session key, session key messages between servers) are read,
  blanked and written again before recording; auth keeps only the handshake and login
- PacketDecoder: a registry by service and message id names every packet and decodes the
  registered structs; CaptureBundle is the file format (DLUBNDL1, metadata, records);
  CaptureTools orders records on one timeline, pulls movement out, makes bundles portable
  or anonymous and diffs replays
- the dashboard keeps packet captures in message_capture_sessions (capture_kind 1) and
  their packets in a file under capture_dir, one write per batch; arming is audited
- MESSAGE_CAPTURE_CONTROL/DATA only gain appended enum values and trailing fields

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

dWorldServer/WorldServer.cpp

@@ -1,6 +1,7 @@
 #include "DashboardActions.h"
 #include "Profiler.h"
 #include <optional>
+#include "PacketCapture.h"
 #include "ConfigSync.h"
 #include "EconomyLedger.h"
 #include "DashboardNotify.h"
@@ -391,6 +392,7 @@ int main(int argc, char** argv) {
 			dpWorld::Initialize(zoneID);
 		}
 		Game::zoneManager->Initialize(LWOZONEID(zoneID, g_InstanceID, cloneID));
+		PacketCapture::SetClone(cloneID);
 		g_CloneID = cloneID;
 	} else {
 		Game::entityManager->Initialize();
@@ -561,6 +563,8 @@ int main(int argc, char** argv) {
 
 		Metrics::StartMeasurement(MetricVariable::PacketHandling);
 
+		PacketCapture::Update();
+
 		//Check for packets here:
 		std::optional<Profiler::Scope> packetScope;
 		packetScope.emplace("Master packets", Profiler::Phase::PACKETS);