Extension MVP

Keep the extension isolated and preserve the web app API.

• Detect token addresses on DEXScreener, DexTools, Uniswap, and similar pages.
• Call /api/extension/risk with chain and token address.
• Show a warning badge: Low, Medium, High, Critical, or Unknown observed risk.
• Link to the full report page in the SaaS app.
• Use cached score by default and avoid storing wallet private data.