fix: replace dead tokensupply.singularitynet.io supply endpoints (#102)

[Kshot3000]

Closes #102.

Three verified tokens still pointed their supply fields at the now-deprecated tokensupply.singularitynet.io API, which returns non-numeric HTML. getAmountFromURL() therefore returns null, and MarketCapApi.getMarketCapInfo() short-circuits to the null response — so Rejuve (RJV), NuNet (NTX) and SingularityNet (AGIX) currently render no market cap / circulating supply.

Change

For each of the three files (8cfd6893…524a56, edfd7a1d…e5458, f43a62fd…474958):

• maxSupply: dead URL → documented total supply as a raw-unit integer (RJV 1e9, NTX 1e9, AGIX 2e9 human × 10^decimals). Matches the existing convention for the ~89 tokens that store a numeric maxSupply.
• circulatingOnChain: dead URL → the on-chain asset id. getAmountFromArray() already resolves a bare asset id via getOnchainAmountOfAsset() (BlockFrost assetsById → quantity) to the live on-chain total — the same mechanism healthy tokens use. This is more accurate than a cached third-party number and removes the external-URL dependency entirely.

No code changes; only the three token YAMLs. maxSupply (number|string) and a circulatingOnChain asset-id item both satisfy tokenSchema (verified against ASSET_ID_REGEX and the getAmountFromArray dispatch).

Notes

• Per the README, new-token submissions require a verification fee, but this is a fix to already-verified tokens flagged in Outdated token entries using deprecated SingularityNet endpoints #102 — no fee applies. Happy to revert any token the team would rather handle directly.
• Sourcing for the max-supply values: Rejuve Gate TGE notice (1,000,000,000 RJV) and official TGE post; NuNet Coinbase price page (Max 1B NTX); SingularityNet CoinGecko (Max 2B AGIX).