fix: send Photon requests to the Helius RPC root

[sergeytimoshin]

Helius Gatekeeper routes Photon calls through JSON-RPC at the RPC root URL. The Rust client appended method paths such as /getIndexerHealth, preventing clients from using https://mainnet.helius-rpc.com/?api-key=....

Send all Rust apis::default_api calls to the configured URL, with the method in the JSON body. Preserve custom endpoint paths, other query parameters, and encoded API keys. The TypeScript client already posts to the root URL; add regression coverage and document mainnet configuration.

Validation:

• cargo test -p photon-api --locked: 14 tests passed.
• TypeScript vitest run tests/unit/rpc/json-rpc-transport.test.ts: 15 tests passed.
• Live read-only requests to mainnet.helius-rpc.com/ succeeded for getIndexerSlot and getCompressedAccount.
• git diff --check passed.

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Reviewing files that changed from the base of the PR and between ad5964f and dd9e55b.

⛔ Files ignored due to path filters (3)

• js/stateless.js/README.md is excluded by none and included by none
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• js/stateless.js/tests/unit/rpc/json-rpc-transport.test.ts is excluded by none and included by none

📒 Files selected for processing (2)

• sdk-libs/photon-api/CHANGELOG.md
• sdk-libs/photon-api/src/lib.rs

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[chatgpt-codex-connector]

Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-08T12:15:48.018257Z	dd9e55b	Draft marked ready

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