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>

dNet/AuthPackets.cpp

@@ -1,4 +1,5 @@
 #include "AuthPackets.h"
+#include "PacketCapture.h"
 #include "MasterPackets.h"
 
 #include <ctime>
@@ -144,6 +145,8 @@ void AuthPackets::LoginRequest::Handle() {
 	stamps.Add(eStamps::PASSPORT_AUTH_DB_SELECT_START);
 	auto accountInfo = Database::Get()->GetAccountInfo(username);
 	stamps.Add(eStamps::PASSPORT_AUTH_DB_SELECT_FINISH, accountInfo ? 1 : 0);
+	// The dashboard's packet capture: this connection is this account's (failed logins included)
+	PacketCapture::Bind(sysAddr, accountInfo ? accountInfo->id : 0, username);
 
 	if (!accountInfo) {
 		LOG("No user by name %s found!", username.c_str());