[Feat] add secret chain

[Marca23]

Implementation details

Add Secret Chain

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[Copilot]

Pull request overview

Adds Secret Network (Cosmos SDK / CosmWasm) as a new target chain type in the relayer, including a remote-only FKMS signer flow, provider/client implementation, config parsing, and DB schema updates to record Secret transactions.

Changes:

• Introduce secret chain provider + client to build/sign (via FKMS) and broadcast Secret txs, then poll confirmation and record metrics/DB transactions.
• Add Secret remote-only wallet/signer integration (FKMS SignSecret) and wire it into wallet/store/config chain-type dispatch.
• Extend DB schema/migrations to accept chain_type='secret' (Postgres enum + SQLite CHECK constraint).

Reviewed changes

Copilot reviewed 17 out of 18 changed files in this pull request and generated 10 comments.

Show a summary per file

File	Description
relayer/chains/secret/config.go	New Secret provider config + provider factory; sets Cosmos bech32 prefixes.
relayer/chains/secret/client.go	New Cosmos/CometBFT RPC client pool for Secret (broadcast/query/tx/block/account).
relayer/chains/secret/provider.go	New Secret relay loop (sign via FKMS, broadcast, confirm, metrics, DB persistence).
relayer/chains/secret/types.go	Secret tx result model used by provider confirmation/persistence.
relayer/wallet/secret/wallet.go	New Secret wallet constructor using remote-only adapter.
relayer/wallet/secret/types.go	JSON signer payload type for FKMS Secret signing.
relayer/wallet/secret/remote_signer.go	New FKMS SignSecret remote signer implementation.
relayer/config/config.go	Add parsing support for chain_type = "secret" provider configs.
relayer/store/filesystem.go	Wire Secret wallet creation into the store wallet factory switch.
relayer/chains/types/chain_type.go	Add ChainTypeSecret and "secret" string mapping.
relayer/db/migrations/postgres/00005_add_secret_chain_type.sql	Add 'secret' value to Postgres chain_type enum.
relayer/db/migrations/sqlite/00001_create_transactions.sql	Expand SQLite chain_type CHECK constraint to include secret.

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