Base Sepolia Testing & Mainnet Deployment

## 🚀 Base Sepolia Testing & Mainnet Deployment

This issue tracks the remaining work after successful Base Sepolia deployment (completed in #117).

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### Phase 3: Testing on Base Sepolia

- [ ] Test account creation with passkey on Base Sepolia
- [ ] Test UserOperation submission via Pimlico bundler
- [ ] Test 2FA transactions
- [ ] Test guardian recovery flow
- [ ] Measure actual gas costs
- [ ] Frontend integration testing

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### Phase 4: Base Mainnet Deployment (After Testing)

- [ ] Deploy to Base mainnet (chain ID: 8453)
- [ ] Update production configuration
- [ ] Enable Base mainnet in frontend

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### 📊 Expected Cost Comparison

| Network | Estimated Cost |
|---------|---------------|
| Ethereum Mainnet | ~$50-100 |
| Base Mainnet | ~$0.10-0.20 |
| Base Sepolia | **$0.09** (actual) |

**Savings: ~500-1000x cheaper than Ethereum mainnet!** 🎉

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### Context

**Deployed Contracts on Base Sepolia:**
- **P256AccountFactory**: `0xF913EF5101Dcb4fDB9A62666D18593aea5509262`
- **P256Account Implementation**: `0xA0ca2CDd6fe515f4C1B87f2aEe2EbD4F1e6EfB1E`
- **EntryPoint v0.7**: `0x0000000071727De22E5E9d8BAf0edAc6f37da032`

See #117 for full deployment details.