Revert "feat: Cleaner gasless implementation" (#405)

Reverts #360

<!-- greptile_comment -->

## Greptile Summary

This PR reverts a gasless transaction implementation (#360), restoring
traditional fee handling across the codebase.

- Changed `LAMPORTS_PER_SIGNATURE` from 0 back to 5000 in
`magicblock-bank/src/consts.rs`, re-enabling standard transaction fees
- Restored payer account initialization with 1000 SOL in
`configs/ephem-*.toml` files, requiring SOL for transaction fees again
- Added validation in `magicblock-config/src/errors.rs` to prevent
ambiguous account initialization (lamports vs SOL)
- Reverted from custom magicblock-svm fork back to official solana-svm
v2.2 in `Cargo.toml`
- Modified bank and genesis config setup in
`magicblock-bank/src/genesis_utils.rs` to restore fee-based transaction
processing



<!-- /greptile_comment -->

Author: GabrielePicco

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