fix(neoforge): guard null recipe source details

[Exohayvan]

Summary

• Initialize a missing or null recipe-source detail list with computeIfAbsent.
• Keep recipe query processing alive when a present map key has a null list.
• Add a regression test for the exact null-list state from the report.

Validation

• bash ./gradlew test --tests net.exohayvan.dissolver_enhanced.data.EMCValuesTest.recipeSourceDetailReplacesNullList
• bash ./gradlew test

Fixes #3