Add BAT: Basic Attention Token

- [YES] I understand that filing an issue does not guarantee addition to the DeFi Swap token list.

**Please provide the following information for your token.**

Token Address: 0x0D8775F648430679A709E98d2b0Cb6250d2887EF
Token Name (from contract): Basic Attention Token
Token Decimals (from contract): 6
Token Symbol (from contract): BAT
Uniswap V2 Pair Address of Token:

Link to the official homepage of token: [https://basicattentiontoken.org/](https://basicattentiontoken.org/)
Link to CoinMarketCap or CoinGecko page of token: [https://coinmarketcap.com/currencies/basic-attention-token/](https://coinmarketcap.com/currencies/basic-attention-token/)

No file, test, or entry point is named. Start by locating how existing token-list entries are represented and validated, then check BAT's address, decimals, symbol, and links against the repository's requirements. Done means BAT is added in the expected format and the project's validation passes.

Written by the indexing model from the issue text.