Epiphany - Modular Skill Tree

Improvements

1. Refactored EffectReward, added an effect source-tracing mechanism
2. Tightened numeric validation on the Effect Reward codec: amplifier now only accepts natural numbers (≥ 0), and duration only accepts -1 or positive integers
3. Optimized the data storage structure for permanent rewards
4. Improved the reward update mechanism on datapack reload
5. Performance optimizations

Bug Fixes

1. Fixed some Insight Tree nodes not being centered properly
2. Fixed temporary Effect rewards being incorrectly re-applied as persistent
3. Fixed permanent Effects not being cleared correctly by /epiphany reset
4. Fixed forceSelect / forceComplete not granting rewards correctly

This update is theoretically non-breaking - existing saves and datapacks can continue to be used. If you encounter any issues, please roll back to the previous version and report them via a GitHub issue.