Router API Docs Sync: document info field on Compute Route 400

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Summary

Update the Compute Route (POST /v2/fungible/route) 400 response to document the info field and the new unsupported direct-CCTP-to-L2 error case.

Changes

• Add info to the 400 response schema for Compute Route, described as user-facing recovery guidance.
• Document the new 400 case: direct EVM CCTP transfers to L2 are rejected with info: "No direct transfers to L2s for this amount. Transfer your funds to L1 and try again." and message: "Invalid toL2, CCTP transfer doesn't support post action.".
• Note that when all candidate routes fail, the response surfaces the first captured route-processing error rather than a generic "Route not found." message.
• Correct the IBC rate-limit description to reference the info field (the actual location of the remaining-capacity string).

Context

Follows upstream PR initia-labs/router-api#173, which added the info field to the CCTP-to-L2 rejection and preserves the first captured error when every candidate route fails.

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Project	Status	Preview	Updated (UTC)
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