feat(tangle-cloud): verify pinned blueprint metadata

[drewstone]

Summary

• verify fetched blueprint metadata against the new onchain metadataHash before enabling advanced hosted tier-2 rendering
• include metadataHash in blueprint create and update flows, GraphQL ingestion, and ABI/client shapes
• harden the hosted blueprint contract tests and trust-state UI around pinned metadata verification and fail-closed fallback

Why

tnt-core now pins blueprint metadata onchain and blueprint can submit the canonical digest at deploy time. The dapp needs to verify the fetched payload against that hash and fall back to the protocol-controlled host when verification fails.

Notes

• verification now checks the fetched metadata payload hash before any attestation logic is trusted
• create/manage flows compute and submit the metadata hash alongside metadataUri
• advanced hosted tier-2 only renders when metadata verification succeeds for the current runtime

Validation

• NX_DAEMON=false yarn nx run tangle-cloud:typecheck
• NX_DAEMON=false yarn nx test tangle-cloud
• NX_DAEMON=false yarn nx run tangle-cloud:build

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[drewstone]

This PR is the consumer end of the metadata-pinning chain and should merge last.

Merge order:

1. tnt-core PR Add fields for syncedBlock and leaves in EVMChainStorage class #106
2. blueprint PR Fixes stats dapp proposal page incorrect threshold data. #1391
3. dapp PR feat(tangle-cloud): verify pinned blueprint metadata #3158

Dependencies:

• tnt-core: feat(blueprints): pin blueprint metadata hashes onchain tnt-core#106
• blueprint: feat(tangle): pin blueprint metadata hashes in deploy manifests blueprint#1391

[claude]

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