refactor(telemetry): colocate SpanNames headers with their classes

Move TxSpanNames.h and TxQSpanNames.h from src/xrpld/telemetry/ to sit
next to the classes they instrument, matching the PathFindSpanNames.h
convention.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/xrpld/app/misc/NetworkOPs.cpp

@@ -13,6 +13,7 @@
 #include <xrpld/app/misc/DeliverMax.h>
 #include <xrpld/app/misc/Transaction.h>
 #include <xrpld/app/misc/TxQ.h>
+#include <xrpld/app/misc/TxSpanNames.h>
 #include <xrpld/app/misc/ValidatorKeys.h>
 #include <xrpld/app/misc/ValidatorList.h>
 #include <xrpld/app/misc/detail/AccountTxPaging.h>
@@ -29,7 +30,6 @@
 #include <xrpld/rpc/DeliveredAmount.h>
 #include <xrpld/rpc/MPTokenIssuanceID.h>
 #include <xrpld/rpc/ServerHandler.h>
-#include <xrpld/telemetry/TxSpanNames.h>
 #include <xrpld/telemetry/TxTracing.h>
 
 #include <xrpl/basics/UptimeClock.h>

src/xrpld/app/misc/detail/TxQ.cpp

@@ -1,7 +1,7 @@
 #include <xrpld/app/ledger/OpenLedger.h>
 #include <xrpld/app/main/Application.h>
 #include <xrpld/app/misc/TxQ.h>
-#include <xrpld/telemetry/TxQSpanNames.h>
+#include <xrpld/app/misc/detail/TxQSpanNames.h>
 
 #include <xrpl/basics/mulDiv.h>
 #include <xrpl/protocol/Feature.h>

src/xrpld/overlay/detail/PeerImp.cpp

@@ -4,11 +4,11 @@
 #include <xrpld/app/ledger/LedgerMaster.h>
 #include <xrpld/app/ledger/TransactionMaster.h>
 #include <xrpld/app/misc/Transaction.h>
+#include <xrpld/app/misc/TxSpanNames.h>
 #include <xrpld/app/misc/ValidatorList.h>
 #include <xrpld/overlay/Cluster.h>
 #include <xrpld/overlay/detail/PeerImp.h>
 #include <xrpld/overlay/detail/Tuning.h>
-#include <xrpld/telemetry/TxSpanNames.h>
 #include <xrpld/telemetry/TxTracing.h>
 
 #include <xrpl/basics/UptimeClock.h>

src/xrpld/telemetry/TxTracing.h

@@ -10,7 +10,7 @@
  *  no-op SpanGuard instances (zero overhead, zero dependencies).
  */
 
-#include <xrpld/telemetry/TxSpanNames.h>
+#include <xrpld/app/misc/TxSpanNames.h>
 
 #include <xrpl/basics/base_uint.h>
 #include <xrpl/telemetry/SpanGuard.h>