Port Villager Recruits 1.15.2 to NeoForge 1.21.1

[nekomario28]

Summary

• Ports Villager Recruits 1.15.2 from Forge to NeoForge for Minecraft 1.21.1.
• Migrates registration, event handling, networking, screens/rendering, configs, mixins, build metadata, and optional integrations.
• Preserves the synchronized upstream 1.15.2 feature set.
• Restores client/server execution boundaries required for dedicated-server safety.
• Removes checked-in local Gradle/IDE cache files from the contribution tree.

Validation

• Recruits-specific GameTests: 5/5 passed.
• Persistence verified across separate dedicated-server processes: recruit UUID, owner, inventory, equipment, and custom name.
• Production JAR audit passed; duplicate ZIP entries: 0.
• NeoForge dedicated-server startup and graceful world save passed.
• Standalone Xvfb client smoke test passed, including world-map and client claim packet class loading.
• Villager Workers integration: 4/4 cross-mod GameTests passed.
• Combined Recruits/Workers dedicated-server and client smoke tests passed.

Environment

• Minecraft 1.21.1
• NeoForge 21.1.219
• Java 21
• Villager Recruits 1.15.2

The contribution is intentionally presented as one commit to keep the large loader migration reviewable. The final tree is identical to the validated synchronization branch.