Phase 6 0.0.17.3 - impact audio, expanding shockwave, chamber ore correction

- Keep one real power-30 Minecraft/Forge explosion.
- Explosion source is intentionally null/generic so Explosion Overhaul processes it in DEFAULT mode.
- Do not layer a custom fake impact boom when Explosion Overhaul is present.
- Shockwave now expands to 252 blocks in 36-block annuli, with distance-decayed additive push.
- Chamber ore placement follows the true ellipsoidal wall; 20-25 unique exposed single ores.
- Preserve 500 HP Nucleus, infected wave, magma, chunk tickets, detailed meteor texture and flight system.
