Cobbledex for REI / EMI / JEI

Changed

• Mod is now explicitly client-only in both Fabric and NeoForge metadata
• Fabric environment set to "client" (was "*"), preventing server-side loading
• NeoForge dependencies set to side="CLIENT" (was "BOTH")
• NeoForge init() now only runs on client dist
• Translations use I18n directly instead of server-safe reflection wrapper

Removed

• Fabric server entrypoint (CobbleDexFabric.kt) — init moved to client entrypoint
• ServerSafeI18n translation wrapper with server fallback (dead code for client-only mod)
• DataSource enum (vestigial from removed server sync, only had NONE/LOCAL)