Port IronAgeFurniture to NeoForge 1.21.11

[SkyBlade1978]

Summary

• port IronAgeFurniture to Minecraft 1.21.11 on NeoForge 21.11.45
• retain optional, condition-driven Biomes O' Plenty and Oh The Biomes We've Gone furniture integrations without hard dependencies
• carry forward the recipe-advancement, furniture-flammability, lava-lamp, texture-validation, and Eclipse/Buildship fixes
• publish deterministic main, sources, and Javadoc artifacts as zone.moddev.mc:iron-age-furniture:0.3.0.121112

Local verification

• exact Eclipse Temurin 21.0.7+6 toolchain
• clean check build javadoc verifyReleaseArtifacts verifyReleaseChecksums prepareEclipse verifyEclipseProductionClasspath
• second clean build javadoc verifyReleaseArtifacts verifyReleaseChecksums
• 17,698 JSON resources, 7,350 locale keys, and 1,521 conditional recipes/advancements validated
• both clean builds produced identical SHA-256 hashes:
  • main: 8DD286A54CDBAC827CFA41AA5229E4B7357C4A694AD475B35E92B08EE98A57B7
  • sources: 419B25403FDB77EA214BC71E9B902DB58974E0470A3FC2FED09FB43709E60219
  • Javadoc: 0A330D1D28DDBC80C0E65952E32164A88889175FA6B8CA4FD971888C33C9AFD0

Manual verification

John completed the NeoForge 1.21.11 hands-on test pass and approved this candidate for release.