feat: add Surf Twitter, Reddit, and Web to service directory

First-party MPP data APIs accepting Tempo USDC payments natively.

- Surf Twitter: 26 endpoints for tweets, users, lists, communities, spaces, trends
- Surf Reddit: 7 endpoints for posts, subreddits, comments, user profiles
- Surf Web: 2 endpoints for web crawling (markdown/HTML) and AI-powered search

All services also support MCP (Model Context Protocol) for AI agent tool calls.

Author: tenequm