feat: Boltz2 NIM v1.5 support with enhanced features (v0.4.0)

[nil16]

Summary

• Add Boltz2 NIM v1.5 compatibility with updated parameter limits
• Change default load balancing strategy to LEAST_LOADED for better throughput
• Add PAE/PDE matrix output support (write_full_pae, write_full_pde)
• Add PDB output format conversion (--output-format pdb)
• Increase parameter limits: recycling (1-10), diffusion (1-25), polymers (1-12), ligands (1-20)
• Add structural templates support for template-guided prediction
• Add helper functions: save_pae_matrix, save_pde_matrix, get_pae_summary
• Add CIF to PDB conversion utilities (convert_cif_to_pdb, convert_pdb_to_cif)
• Update Docker examples to use boltz2:1.5.0 with --shm-size=16G
• Replace real IPs with RFC 5737 documentation IPs in examples
• Update documentation and parameter guides for v1.5

Test plan

• Tested multi-endpoint predictions with 2 endpoints (localhost:8010, remote:8010)
• Verified PAE matrix output with --write-full-pae flag
• Tested PDB output format with --output-format pdb
• Validated recycling_steps=10 and diffusion_samples=25 work correctly
• Published to PyPI as v0.4.0