feat(antd-go): PrepareUploadPublic + DataMapAddress

[Nic-dorman]

Summary

Adds the antd-go consumer for the visibility/data_map_address wire shape landed in antd 0.6.1 (#57). This is indelible's migration target for the bundled atomic external-signer public upload.

Change

• New method PrepareUploadPublic(ctx, path) (*PrepareUploadResult, error) — POSTs visibility:"public" to /v1/upload/prepare. The daemon bundles the serialized DataMap as one extra chunk in the same PreparedUpload payment batch, so the external signer signs ONE EVM tx covering chunks + DataMap.
• New field DataMapAddress string on FinalizeUploadResult, populated from the daemon's data_map_address response field when the upload was prepared with visibility:"public".
• Existing PrepareUpload / FinalizeUpload signatures unchanged. Old daemons (pre-0.6.1) don't return data_map_address, so the new field is empty for callers talking to them — backward compatible.

Wire-compat

Caller	Daemon	Result
PrepareUploadPublic	antd >= 0.6.1	true public prepare; bundled DataMap; DataMapAddress populated on finalize
PrepareUploadPublic	antd < 0.6.1	daemon ignores visibility field, returns private prepare; DataMapAddress stays "" on finalize
PrepareUpload (old method)	any	unchanged behavior, DataMapAddress stays ""

Test plan

• go test ./... — 4 new test cases pass alongside existing suite:
  • TestPrepareUploadPublicSendsVisibility — verifies the request body contains visibility:"public"
  • TestFinalizeUploadSurfacesDataMapAddress — verifies the new field is extracted from the response
  • TestFinalizeUploadOmitsDataMapAddressForPrivate — verifies wire-compat with daemons that don't emit the field
• End-to-end mainnet validation against the antd 0.6.1 daemon (via the equivalent Python wire shape — same JSON requests/responses): 4 quotes paid in 1 atomic tx, finalize returned data_map_address, download_public round-tripped byte-for-byte. See feat(antd): wire visibility through /v1/upload/prepare #57 for the on-chain artifacts.

Next

• After merge, cut antd-go/v0.6.1 tag for indelible to consume.

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