Restore TEE registry contract reads

[0xadvait]

Summary

• remove the extra TEE registry API route and client fetch wrapper added in Load TEE registry through API route #10
• restore the existing contract module as the single source for TEE registry reads, types, address, and query key
• point TEE UI imports back to the contract module and keep disabled/raw registry counts out of the visible copy
• cap the homepage live-operator preview to three active operators so the home layout stays stable
• update affected home/hero Playwright screenshots to the branded explorer baseline

Verification

• yarn eslint lib/opengradient/contracts/teeRegistry.ts ui/home/HeroBanner.tsx ui/home/TrustedExecution.tsx ui/opengradient/teeRegistry/TEENodeDetailDrawer.tsx ui/opengradient/teeRegistry/TEENodesTable.tsx ui/opengradient/teeRegistry/TEETypeCard.tsx ui/opengradient/teeRegistry/placeholders.ts ui/pages/opengradient/TEERegistry.tsx
• yarn tsc -p ./tsconfig.json --noEmit
• browser check: http://localhost:3010/tee-registry shows LLMProxy, 3 active/enabled records, no Loading/No data, and no /80-style count
• yarn test:pw --project=default ui/home/HeroBanner.pw.tsx ui/pages/Home.pw.tsx
• yarn test:pw --project=dark-color-mode ui/home/HeroBanner.pw.tsx ui/pages/Home.pw.tsx