feat!: unify payment_vault_address across daemon and all SDKs

[Nic-dorman]

Summary

ant-node (a08a727) unified data_payments_address + merkle_payments_address into a single payment_vault_address (PaymentVault contract). evmlib 0.8.0 and ant-core already use the unified API. This PR adapts antd and all 15 SDK clients.

BREAKING CHANGE: PrepareUploadResponse now returns payment_vault_address instead of separate data_payments_address / merkle_payments_address fields.

What changed

antd daemon

• Env var: EVM_PAYMENT_VAULT_ADDRESS (with EVM_DATA_PAYMENTS_ADDRESS fallback for backward compat)
• EVM_MERKLE_PAYMENTS_ADDRESS: removed entirely — both payment modes use the same vault contract
• types.rs: PrepareUploadResponse collapses two optional fields into one required payment_vault_address: String
• upload.rs: vault address read once at top of build_prepare_response(), shared by both wave-batch and merkle paths
• openapi.yaml: version bumped 1.0.0 → 2.0.0, schema updated

All 15 SDK clients

Same mechanical rename across model definitions, JSON parsing, and test fixtures:

Go, JS, Python, Rust, C#, C++, Dart, Elixir, Java, Kotlin, Lua, PHP, Ruby, Swift, MCP

FFI

• ffi/rust/ant-ffi: parameter rename data_payments_address → payment_vault_address
• evmlib 0.5.0 → 0.8.0 to align with antd

Scripts & docs

• start-local.sh, start-local.ps1, ant-dev/cmd_start.py: emit single EVM_PAYMENT_VAULT_ADDRESS with manifest fallback
• test-api.sh: updated prerequisites to list jq dependency
• README.md, skill.md, llms-full.txt: updated

Bonus: C++ graph cleanup

Removed stale GraphEntry/GraphDescendant references from async_client, grpc_client, and tests (types were removed in an earlier PR but code references remained, causing build failures).

Verification done

Test suite	Result
antd daemon (cargo test)	6/6 passed
antd-rust contract tests	54/54 passed
antd-js (npm test)	44/44 passed
antd-py (pytest)	46/46 passed
antd-go (go test)	All passed
antd-ruby	24/24 passed
antd-csharp (dotnet test)	24/24 passed
antd-java (gradle test)	BUILD SUCCESSFUL
antd-cpp (ctest)	2/2 passed (34 test cases)
Clippy	Clean, zero warnings
Live devnet integration	Health, data endpoints, wallet all working with EVM_PAYMENT_VAULT_ADDRESS
Manifest check	ant-node emits payment_vault_address, old fields absent

Supersedes

Closes #22 (partial scripts-only fix — now included in this broader change)

Test plan

• CI passes (fmt, clippy, doc, test)
• Start local devnet — verify antd accepts EVM_PAYMENT_VAULT_ADDRESS
• Verify prepare-upload response contains payment_vault_address (not old field names)
• Grep audit: data_payments_address only appears in env var fallback code

🤖 Generated with Claude Code