[PWGEM] Add new event mixing logic based on photon legs#16956

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Steffimro:pcm-hbt-legpool

Commits on Jul 7, 2026

Store leg kinematics in photon mixing pool. Replace EMPair with a local PhotonWithLegs struct in the EventMixingHandler pool
Stefanie Mrozinski
committed
Bug fix: fix double filling of hSparse_DEtaDPhi_qinv_kT in MC pairing
Stefanie Mrozinski
committed
Bug fix: e+/e- assignement in efficiency correctly implemented
Stefanie Mrozinski
committed
Add SE/ME same-sign leg separation QA for pair efficiency extraction
Stefanie Mrozinski
committed
Fix o2-linter findings
Stefanie Mrozinski
committed