…T API

Adds JSON-RPC chain pages and OpenRPC specs for Bitcoin Cash (mainnet/testnet), Litecoin (mainnet/testnet), and Dogecoin (mainnet), each surfacing the same 38 Bitcoin-style methods that already live in src/openrpc/chains/_components/bitcoin/methods.yaml. Also adds a new src/openapi/utxo/utxo.yaml OpenAPI 3.1 spec covering the 12 Trezor Blockbook REST endpoints (block-index, tx, tx-specific, address, xpub, utxo, block, sendtx GET+POST, tickers-list, tickers, balancehistory) for all 7 supported UTXO networks (Bitcoin Mainnet, Bitcoin Testnet 4, Bitcoin Cash mainnet/testnet, Litecoin mainnet/testnet, Dogecoin Mainnet). Wires the UTXO API endpoints under each chain section in docs.yml.

Refs DOCS-71

Codex flagged that Blockbook explicitly requires the trailing slash on POST /api/v2/sendtx/ (per upstream docs: 'NB: the / symbol at the end is mandatory.'). Generated clients following the no-slash spec literally would route-miss on the actual endpoint. Update the path key in src/openapi/utxo/utxo.yaml to include the trailing slash and disable the Redocly no-path-trailing-slash rule globally so the linter does not contradict upstream behavior.

Refs DOCS-71

Requested-by: @SahilAujla

Override the auto-generated slug on the Bitcoin Cash API Endpoints
section in content/docs.yml so URLs render as
/chains/bitcoincash/bitcoincash-api-endpoints/<method> instead of
/chains/bitcoincash/bitcoin-cash-api-endpoints/<method>, matching the
chain folder slug. Mirrors the existing pattern on Base and Astar.

Refs DOCS-71

…om link-check

The new Bitcoin Cash, Dogecoin, and Litecoin overview pages link to per-method endpoint pages of the form /docs/chains/<chain>/<chain>-api-endpoints/<method>.

These pages are generated by Daikon's daily noon-EST chain-spec sync once the chain-config lands. Until then, lychee 404s on each linked method (34 methods x 3 chains = 102 broken links), failing the Link Check CI job even though the references are correct and match the Bitcoin pattern that works in production.

Add narrow exclude patterns for these three chain endpoint URL prefixes only. Remove the excludes after the first post-launch Daikon run materializes the method pages.

Refs DOCS-71