Meter EVM gas for asset‐ID conversion and enforce storage_growth in X-Tokens precompiles

[lavish0000]

This PR resolves two high-severity audit findings:

Assets-Factory:
• Add _handle.record_db_read::(36)?; to convert_asset_id_to_address
• Ensures the 36-byte lookup is properly charged gas

X-Tokens:
• Import pallet_balances::SYSTEM_ACCOUNT_SIZE
• Replace every try_dispatch(..., 0) with try_dispatch(..., SYSTEM_ACCOUNT_SIZE)?

audit findings 3 & 4.

[Copilot]

Pull Request Overview

This PR implements gas metering and enforces a minimum storage growth cost for two precompile modules.

• Assets-Factory: meters a 36-byte DB read in convert_asset_id_to_address.
• X-Tokens: replaces zero storage growth in try_dispatch calls with SYSTEM_ACCOUNT_SIZE.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
precompiles/assets-factory/src/lib.rs	Add _handle.record_db_read::<Runtime>(36)?; to meter asset ID lookup.
precompiles/xtokens/src/lib.rs	Update try_dispatch calls to use SYSTEM_ACCOUNT_SIZE instead of 0.

Comments suppressed due to low confidence (1)

precompiles/assets-factory/src/lib.rs:78

• Add unit tests to verify that the 36-byte DB read is charged correctly and that error paths propagate as expected.

_handle.record_db_read::<Runtime>(36)?;

[neutrinoks]

LGTM 🚀