[PWGDQ] Add name mappings for all FIT detector variables

Following the pattern of ZDC variables (kEnergyZNC2, etc.), add
fgVarNamesMap entries for all 35 FIT detector variables:
- FT0 variables (amplitude, time, trigger mask, fired channels, pileup flags)
- FDD variables (amplitude, time, trigger mask, fired channels, pileup flags)
- FV0A variables (amplitude, time, trigger mask, fired channels, pileup flags)
- BC distance variables (TOR, TSC, TVX, V0A, T0A)

This ensures FIT variables can be properly referenced by name in
histogram configurations and analysis code, similar to other detector
variables in VarManager.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: minjungkim12

PWGDQ/Core/VarManager.cxx

@@ -1554,6 +1554,39 @@ void VarManager::SetDefaultVarNames()
   fgVarNamesMap["kTimeZNC"] = kTimeZNC;
   fgVarNamesMap["kTimeZPA"] = kTimeZPA;
   fgVarNamesMap["kTimeZPC"] = kTimeZPC;
+  fgVarNamesMap["kAmplitudeFT0A"] = kAmplitudeFT0A;
+  fgVarNamesMap["kAmplitudeFT0C"] = kAmplitudeFT0C;
+  fgVarNamesMap["kTimeFT0A"] = kTimeFT0A;
+  fgVarNamesMap["kTimeFT0C"] = kTimeFT0C;
+  fgVarNamesMap["kTriggerMaskFT0"] = kTriggerMaskFT0;
+  fgVarNamesMap["kNFiredChannelsFT0A"] = kNFiredChannelsFT0A;
+  fgVarNamesMap["kNFiredChannelsFT0C"] = kNFiredChannelsFT0C;
+  fgVarNamesMap["kAmplitudeFDDA"] = kAmplitudeFDDA;
+  fgVarNamesMap["kAmplitudeFDDC"] = kAmplitudeFDDC;
+  fgVarNamesMap["kTimeFDDA"] = kTimeFDDA;
+  fgVarNamesMap["kTimeFDDC"] = kTimeFDDC;
+  fgVarNamesMap["kTriggerMaskFDD"] = kTriggerMaskFDD;
+  fgVarNamesMap["kNFiredChannelsFDDA"] = kNFiredChannelsFDDA;
+  fgVarNamesMap["kNFiredChannelsFDDC"] = kNFiredChannelsFDDC;
+  fgVarNamesMap["kAmplitudeFV0A"] = kAmplitudeFV0A;
+  fgVarNamesMap["kTimeFV0A"] = kTimeFV0A;
+  fgVarNamesMap["kTriggerMaskFV0A"] = kTriggerMaskFV0A;
+  fgVarNamesMap["kNFiredChannelsFV0A"] = kNFiredChannelsFV0A;
+  fgVarNamesMap["kBBFT0Apf"] = kBBFT0Apf;
+  fgVarNamesMap["kBGFT0Apf"] = kBGFT0Apf;
+  fgVarNamesMap["kBBFT0Cpf"] = kBBFT0Cpf;
+  fgVarNamesMap["kBGFT0Cpf"] = kBGFT0Cpf;
+  fgVarNamesMap["kBBFV0Apf"] = kBBFV0Apf;
+  fgVarNamesMap["kBGFV0Apf"] = kBGFV0Apf;
+  fgVarNamesMap["kBBFDDApf"] = kBBFDDApf;
+  fgVarNamesMap["kBGFDDApf"] = kBGFDDApf;
+  fgVarNamesMap["kBBFDDCpf"] = kBBFDDCpf;
+  fgVarNamesMap["kBGFDDCpf"] = kBGFDDCpf;
+  fgVarNamesMap["kDistClosestBcTOR"] = kDistClosestBcTOR;
+  fgVarNamesMap["kDistClosestBcTSC"] = kDistClosestBcTSC;
+  fgVarNamesMap["kDistClosestBcTVX"] = kDistClosestBcTVX;
+  fgVarNamesMap["kDistClosestBcV0A"] = kDistClosestBcV0A;
+  fgVarNamesMap["kDistClosestBcT0A"] = kDistClosestBcT0A;
   fgVarNamesMap["kQ2X0A1"] = kQ2X0A1;
   fgVarNamesMap["kQ2X0A2"] = kQ2X0A2;
   fgVarNamesMap["kQ2Y0A1"] = kQ2Y0A1;