Prop 75: Set Validator Rewards to Zero (For Chain Migration Purpose)

To support the chain migration, we plan to stop all block rewards and set them to zero. This will make sure no new rewards are created on the old chain while we move to the new one. All delegators will need to undelegate their PUNDIAI tokens and migrate them to the new chain. This step helps keep everything clear, avoids confusion, and ensures the migration goes smoothly for everyone.