Port IronAgeFurniture to NeoForge 1.20.6

[SkyBlade1978]

Summary

• port IronAgeFurniture from Forge 1.20.6 to NeoForge 20.6.139 on Java 21
• retain the ironagefurniture runtime/save identity and publish as zone.moddev.mc:iron-age-furniture:0.3.0.120062
• use native NeoForge conditions for optional Biomes O' Plenty recipes and recipe advancements, with no hard dependency
• carry forward ingredient-specific advancement unlocks, ordinary wood flammability with Crimson/Warped exclusions, and restored lava-lamp interactions
• validate BOP and legacy vanilla texture mappings against the pinned integration inputs
• provide deterministic artifacts and reproducible Eclipse/Buildship setup, including the cached synchronization-task compatibility bridge

Verification

• user-completed hands-on Minecraft/Eclipse testing
• gradlew.bat clean
• gradlew.bat check build javadoc verifyReleaseArtifacts verifyReleaseChecksums prepareEclipse verifyEclipseProductionClasspath --no-daemon --stacktrace --max-workers=2
• gradlew.bat verifyPreparedReleaseArtifacts -PpreparedReleaseDir=<staged bundle> --no-daemon --stacktrace
• 7,532 resource JSON documents, 3,462 locale keys, 507 conditional recipes, and 507 conditional advancements validated
• exact three-jar release bundle and SHA-256 manifest audited

Release

This PR prepares version 0.3.0.120062. Publication remains gated by the protected default-branch dispatcher after the exact merged commit passes hosted CI.