[Zig] Implement ERC Standards modules

[roninjin10]

Summary

Implement ERC token standard modules in Zig to match TypeScript.

Standards to Implement

ERC-20 (Fungible Tokens)

• balanceOf encoding/decoding
• transfer encoding/decoding
• approve encoding/decoding
• transferFrom encoding/decoding
• allowance encoding/decoding
• Event decoding (Transfer, Approval)

ERC-721 (NFTs)

• ownerOf encoding/decoding
• safeTransferFrom encoding/decoding
• tokenURI encoding/decoding
• Event decoding (Transfer, Approval, ApprovalForAll)

ERC-1155 (Multi-Token)

• balanceOf / balanceOfBatch
• safeTransferFrom / safeBatchTransferFrom
• Event decoding

ERC-165 (Interface Detection)

• supportsInterface encoding/decoding

Current State

No ERC standard modules in Zig.

Note: Issue created by Claude AI assistant, not @roninjin10 or @fucory