Carry the TRD geometry in double

This converts the TRD volume tree and the constants of TRDBase/GeometryBase.h from float to
double.

- createVolume forwards to the Double_t* overload of Gsvolu, so the 22 shape arrays and the
  placement locals move with it.
- Derived constants such as CH, CHSV, ANODEPOS, FLENGTH and XETHICK were summed in float while
  Geometry.cxx rebuilds the same quantities in double; the constants and their 23 constexpr
  getters are now double.
- rotateBack, kTiltAngle, the pad-plane locals and the PadPlane accessors keep float: they are
  reconstruction values.
- Zero-length exits under VecGeom navigation fall from 307310 to 47851 over the same events, and
  TRD hits go from 96 % to 102 % of TGeo.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

Author: sawenzel

Detectors/TRD/base/include/TRDBase/Geometry.h

@@ -64,7 +64,7 @@ class Geometry : public GeometryBase, public o2::detectors::DetMatrixCacheIndire
   static const o2::detectors::DetID sDetID;
 
   // helper function to create volumes and registering them automatically
-  void createVolume(const char* name, const char* shape, int nmed, float* upar, int np);
+  void createVolume(const char* name, const char* shape, int nmed, double* upar, int np);
 
   Geometry();