Port Sky's Grass Slabs to Minecraft 26.2

[SkyBlade1978]

Summary

• port the complete mod to Minecraft 26.2 and Forge 65.1.0
• retain grass slabs, paths, turf, recipes, smoothing and supported world upgrades
• update the ForgeGradle 7, Java 25, Eclipse and CI setup for Forge 65
• restore translated names for all four block items and set version 1.1.1.2602001

Verification

• clean tests, build, Javadocs, Eclipse checks and release audit passed
• 47 focused tests and all 17 GameTests passed
• packaged client/server and compatibility gates passed
• upgrade fixtures from 1.10.2 through 26.1.2 passed first-load and reload checks
• cold-cache bootstrap and offline replay passed
• two clean builds produced identical release artifacts

Main jar SHA-256: 680558A0729D91F0EFBC9337392E93B692B99C12C7A03AA84AE1C98201D0330B