Store TPC track A/C side info in the AO2D TrackExtra.fFlags unused bits

[shahor02]

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[miranov25]

Thanks Ruben for the quick implementation — this is exactly what we discussed.

Summary: This PR adds TPC side information (A/C/both) to the AO2D track flags.

Changes:

• New flags in DataTypes.h: TPCSideA = 0x20 (bit 5), TPCSideC = 0x40 (bit 6)
• Uses existing hasASideClusters() / hasCSideClusters() methods from TPC track class

Interpretation:

• 00 = No TPC
• 10 = A-side only
• 01 = C-side only
• 11 = Both sides (crosses CE)

Use cases:

• Cosmic muon association — know which side each half-track is on
• Fake split rejection — identify incorrectly split CE-crossing tracks
• Efficiency studies — we observed a spike excess for TPC-only tracks and a corresponding decrease for combined tracks near CE; this variable provides a handle to diagnose it
• Jet energy bias — efficiency loss near CE affects jet reconstruction; we lose part of the fiducial volume within the jet, registering only a fraction of the energy
• Time reassociation — constrain allowed drift direction, reducing combinatorial background

Cost: No AO2D schema change, uses 2 unused bits, ~1 bit effective entropy.

=== Diff summary was automatically compared with agrrement in matermost discussion

Lets merge