Add Vealth (Services/Endpoints) to ecosystem

[brawlaphant]

Adds Vealth to the ecosystem directory under Services/Endpoints, per the site README's submission steps (partners-data folder + logo + metadata.json).

Vealth is an ecological work protocol on Base: 30 paid x402 endpoints covering the lifecycle of ecological work — work packets, proof checks, on-chain settlement attestation, carbon retirement — plus building/food/ecosystem scorecards. Endpoints emit both the x402 v2 challenge (PAYMENT-REQUIRED header, CAIP-2, Bazaar-style input schemas in extensions) and the v1 body for compatibility, self-settled EIP-3009 USDC, no facilitator dependency. Catalog: https://vealth.net/x402.html · OpenAPI: https://vealth.net/openapi.json · agent surface: https://vealth.net/llms.txt

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https://claude.ai/code/session_0161q2gd7JGFLUcrx3w11WpN

[cb-heimdall]

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