New tables for the celestial body hierarchy below system level:
- bodies: planets, moons, gas giants, asteroid belts, oort clouds
with physical properties, settlement data, and cultural overrides
- stations: orbital/surface facilities with type, population,
docking class, and gate infrastructure flag
Naming convention: GJ-{n}b (planet), GJ-{n}b-1 (moon),
GJ-{n}b-S1 (station), GJ-{n}-oort (oort cloud).
Self-referential parent_body_id for moon→planet relationships.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>