feat: Add latitude-based world generation with extra-large biomes
- Custom BiomeSource distributes biomes by Z coordinate (north=cold, south=hot) - Extra-large biomes (~3000 blocks, 8x vanilla) - Underground biomes follow surface temperature logic - Always spawn in plains near Z=0 - Welcome message explaining latitude mechanics - Uses amplified noise settings for higher mountains - BOP biomes integrated in temperature bands - Selectable as 'Large Latitude' world type in world creation - New config section 'world_generation' - Version bumped to 2.2.0
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