Port IronAgeFurniture to Forge 26.3

[SkyBlade1978]

Summary

• Port IronAgeFurniture to Minecraft 26.3 and Forge 66.0.2 on exact Temurin Java 25.0.3+9.
• Preserve the ironagefurniture runtime/save namespace, zone.moddev.mc.ironagefurniture Java namespace, and target-aware Maven/version identity.
• Retain the complete vanilla furniture and lighting catalog, including Pale Oak, while omitting optional integrations that do not yet have compatible Forge 26.3 releases.
• Generate Forge 66 item definitions and target-native recipe and advancement data from the deterministic checked-in furniture catalog.
• Carry forward accurate recipe unlocks, ordinary-wood flammability, fireproof nether woods, throwable/falling translucent lamps, water shattering, ice melting, redstone states, and saved-ID mappings.
• Fix waterlogging a lava-filled floor or wall sconce so it becomes the matching waterlogged empty sconce, preserves its support block, and drops exactly one obsidian chunk.
• Update README, release notes, CI, Eclipse/Buildship metadata, and release routing for 0.3.0.2603001.

Verification

• Project owner completed manual Forge 26.3 gameplay/runtime testing, including the lava-sconce waterlogging regression.
• clean check build javadoc verifyReleaseArtifacts writeReleaseChecksums verifyReleaseChecksums verifyEclipseProductionClasspath passed under Temurin 25.0.3+9.
• Two clean builds produced identical SHA-256 hashes for the main, sources, and Javadoc JARs.
• 4,477 resource JSON documents and 1,734 locale keys validated.
• A dedicated-server regression probe verified both floor and wall lava sconces retain their waterlogged empty-sconce state, preserve their support, and produce one obsidian chunk.
• The worktree was clean at commit 19c70c3ba before publication.

Publication remains gated on the protected release dispatcher after this PR and its post-merge checks are green.