Eclipse Expansion

# Eclipsium: Eclipse Expansion — v0.6 "The Locus Biomes Update"

## New biomes in the Locus Eclipsis
- Added **Silent Plains** — flat terrain, no trees, dense fog
- Added **Corrupted Forest** — darker, denser version of the Valley with mutated trees
- Added **Eclipse Abyss** — deep canyons with Eclipse Ore exposed on the walls
- Added **Cult Lands** — biome where cult structures generate more frequently
- The Locus Eclipsis now uses `multi_noise` to distribute the 5 biomes by temperature

## New blocks
- Added **Corrupted Log** and **Corrupted Leaves** — wood exclusive to the Corrupted Forest
- Eclipse Ore now generates correctly in the Silent Plains (Y30–Y80)

## Vegetation
- New corrupted tree with a twisted trunk and dense foliage, exclusive to the Corrupted Forest
- Falling petal particle system for leaves (Eclipse and Corrupted), with distinct colors (purple / crimson) reusing the vanilla petal texture
- Optimized the leaf system to eliminate FPS drops caused by natural leaf decay

## Structures — Cult Lands
7 new structures spread across different rarities:
- **Eclipse Citadel** — massive fortress with walls, towers, and a central pyramid (very rare)
- **Eclipse Cathedral** — gothic nave with twin towers (rare)
- **Sacrifice Colosseum** — circular arena with stands and a gladiator chamber (rare)
- **Cult of the Eclipse Temple** — stepped ritual pyramid (rare)
- **Eclipse Trial Chamber** — dungeon with trial_spawner + vault, Trial Chamber-style (rare)
- **Cult Watchtower** — 4-story tapering tower (medium)
- **Sacrifice Altar** — small, frequent shrine

All use polished blackstone as the base material, temporary vanilla guardians (Evoker/Vindicator/Pillager/Vex/Witch), and their own loot tables per structure.

## Audio
- Fixed the Valley of the Eclipse ambient sound not playing in the Corrupted Forest due to a missing `ambient_sound` field in the biome's datapack

## Technical fixes
- Fixed a TerraBlender crash when opening the debug screen (F3) inside the Locus Eclipsis (compatibility mixin)
- Fixed unwanted purple tint on Eclipse leaves (now show their real color)
- Fixed biome, feature, and particle registration errors caused by class loading order

## Planned for future versions
- Replace vanilla guardians in cult structures with the mod's own entities (Muru/Rednal)
- Add the mod's own items to cult loot tables
- Structures for Silent Plains, Corrupted Forest, and Eclipse Abyss