Add GoPlus Security plugin

[0xbeekeeper]

Summary

• Add goplus-security, a read-only GoPlus Security plugin for OKX Plugin Store
• Supports EVM token security, malicious address checks, phishing website checks, NFT security, approval security, Solana token security, and Sui token security
• Uses GoPlus API via documented curl workflows; no binary wrapper and no transaction-capable operations

Safety

• Read-only security intelligence plugin
• Does not sign transactions, broadcast transactions, transfer assets, revoke approvals, or handle private keys
• Declares external API domain: api.gopluslabs.io

Validation

• plugin-store lint skills/goplus-security passes with one expected warning for curl-based external API requests
• Live E2E checked GoPlus authentication and token security API against Ethereum USDT; API returned code=1, message=OK

Commit Author

• Commit author and committer are 0xbeekeeper <24714804+0xbeekeeper@users.noreply.github.com>