feat: update Moonbeam and Polkadot dependencies for runtime-3700

[crystalin]

Summary

• Updates @polkadot/api and related packages to v16.2.2 for compatibility with Polkadot-SDK stable2412
• Removes deprecated moonbeam-types-bundle in favor of the modern api-augment approach
• Ensures all dependencies are aligned with Moonbeam runtime-3700 requirements

Breaking Changes Addressed

Based on the runtime-3700 release notes:

Identity Pallet

• Modified storages: IdentityOf, PendingUsernames
• Added storages: UsernameOf, UnbindingUsernames
• Renamed storages: AccountOfUsername → UsernameInfoOf, UsernameAuthorities → AuthorityOf

Impact: The codebase uses api.query.identity.identityOf which remains compatible.

Precompile Changes

• Calling a precompile now incurs ~1,669 additional gas
• StorageCleanerPrecompile has been removed

Impact: No code changes required as the project doesn't directly interact with precompiles in a way that would be affected.

Changes Made

1. Updated @polkadot/ packages*:

   • @polkadot/api: 15.10.2 → 16.2.2
   • @polkadot/rpc-core: 15.10.2 → 16.2.2
   • @polkadot/types: 15.10.2 → 16.2.2
   • @polkadot/util & util-crypto remain at 13.5.2 (latest)

2. Removed moonbeam-types-bundle:

   • Deleted dependency from package.json
   • Updated src/utils/networks.ts to use @moonbeam-network/api-augment import
   • Removed typesBundle parameter from ApiPromise.create() calls

3. Fixed tests:

   • Updated test expectations to match new API initialization

Test Results

✅ All tests passing
✅ Build successful
✅ Linting passes (only warnings, no errors)

Verification

npm test
npm run build
npm run lint

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