You are extending an existing TypeScript backend that already wires one DEX aggregator (assume 1inch or 0x). Add Velora as a parallel quote source.
Requirements:
- Velora endpoint: `GET https://api.velora.xyz/v2/quote` with `mode=ALL` and `partner` set to the host app's partner identifier (`my-app-name` is only a placeholder). The `mode=ALL` response contains exactly one of `delta` or `market` (server-picked winner). To compare Delta vs Market head-to-head before competing against the other aggregator, issue two requests in parallel (`mode=DELTA` and `mode=MARKET`), then pick the better Velora result.
- Compare on `destUSD` (or `destAmount` normalized to a common token) net of `gasCostUSD` and `partnerFee`.
- Fan out in parallel; respect a hard 800ms budget per quote source; fall back gracefully if one source times out.
- For the Velora native-ETH placeholder use `0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE` (mixed case).
- If Velora wins via Delta, return both the `delta` block and `hmac` to the caller so they can sign and submit. If via Market, return the `market` block (same shape as `/prices`'s `priceRoute`).
Reference these docs and follow them exactly:
- https://velora.xyz/docs/overview/why-velora
- https://velora.xyz/docs/api-reference/market/prices
- https://velora.xyz/docs/api-reference/market/quote
Do NOT race-update shared state across the two aggregators' callbacks. Do NOT fall back silently to the slower source if the budget is exceeded; surface a clear error.
