feat: add PayLobster action provider for agent payments on Base

Adds PayLobster action provider enabling AI agents to interact with
PayLobster's agent-to-agent payment infrastructure on Base L2.

Features:
- Register agent identity on-chain
- Create and release USDC escrow payments
- Check reputation scores
- Query credit scores and limits
- Retrieve agent profiles

All contracts are live on Base Mainnet (Chain ID: 8453) with real USDC.
Includes comprehensive test coverage for all 6 actions.

Signed-off-by: Gustav <gustav@Gustavs-Mac-mini.local>

Author: Gustav