C1-C4 StoBe path with 0-based 3Dmol serials

Atlas-aligned ZnPc geometry and C1-C4 carbon_indices

fix: use tpznpc_0m_rotated_proper.xyz geometry

fix: map atomid 1-4 to StoBe C01-C04

fix: ZnPc XYZ from StoBe C01-C04 excitation centers

feat: package ZnPc clustering demo assets under data/