Cardano Updates

GQL Update 2

GQL Updated

Add GQL

metadata: update ORXU token metadata to v1 and add logo/url

ci: validate only mapping files, allow docs/other repo changes

Register ORXU token metadata - decimals 6

The Validate-Metadata job asserted that every changed file in a PR was a
hex-named JSON under mappings/, so any PR touching docs or other repo
files (e.g. README.md, LICENSE, .github/) failed with
"FAIL location/is hex/length" even when no mapping was involved.

- Skip non-mapping files in the validation loop instead of failing them;
  they remain covered by human review.
- Restrict the token-metadata-creator validation loops to mappings/
  files so they no longer attempt to validate non-mapping files.

Token mapping submissions are validated exactly as before.

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

docs: document hosted endpoints & cross-references

- Document the hosted Token Metadata Server for both mainnet
  (https://tokens.cardano.org) and preprod
  (https://preprod.tokens.cardano.org), with OpenAPI /apidocs links,
  mirroring developer-portal PR #1801.
- Add a "Network environments" table clarifying CIP-68 (on-chain) and
  CIP-26 (off-chain) sources per network.
- Cross-reference CIP-26/CIP-68, offchain-metadata-tools,
  metadata-registry-testnet, the Developer Portal token registry guide,
  and the Wiki.
- Restructure registration/well-formedness sections for readability.

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>