Task 441: Deduplicate ORBIT_RADIUS Constants

Status: DONE

Summary

mission-timeline.ts and relativistic-analysis.ts duplicate orbit radius values (Mars 227,939,200, Jupiter 778,570,000, etc.) that are already exported from orbital.ts as ORBIT_RADIUS.MARS, ORBIT_RADIUS.JUPITER, etc. Replace with imports.

Files to Change

1. mission-timeline.ts — BODY_AU uses inline km values ÷ AU_KM, replace with ORBIT_RADIUS / AU_KM
2. relativistic-analysis.ts — inline orbit radii in distance calculations