feat(tangle-cloud): register the LLM Inference blueprint app

[drewstone]

Summary

Registers the LLM Inference blueprint as a curated app in Tangle Cloud, embedding the hosted iframe at https://llm-inference.blueprint.tangle.tools/ (Cloudflare Pages, deployed). Matches the tangle / llm-inference blueprint metadata — same pattern as AI Trading / AI Agent Sandbox.

• The iframe inherits the connected wallet and self-configures from the operator's /v1/operator (model, pricing, shielded_credits, chain_id) — no hardcoded addresses.
• Read surface only for now (allowReadAccount, no contract grants). Funding deposits (approve + fundCredits) need sendTransaction allowlisted against the live develop ShieldedCredits + payment-token addresses — a follow-up once the develop operator + gateway are deployed. Per-request SpendAuths are signed inside the iframe by an ephemeral key and never touch the bridge.

Verified

• UI live at https://llm-inference.pages.dev (custom domain llm-inference.blueprint.tangle.tools provisioning).
• blueprintApps suite green: 36 tests; tangle-cloud:typecheck clean; full pre-push (lint/test/build) passed.
• Full inference path proven locally (SDK -> operator -> ShieldedCredits on anvil -> cli-bridge model), see feat(operator): external backend connect-mode + self-advertised payment config + SDK e2e llm-inference-blueprint#10.

Test plan

• vitest run src/blueprintApps/*.spec.ts — 36 passing
• tsc --noEmit -p tsconfig.app.json clean
• Visual: app card renders + iframe embeds in develop once the custom-domain cert provisions

[tangletools]

Curated entry mirrors the trading/sandbox pattern; tangle-cloud typecheck + blueprintApps suite green; UI live at llm-inference.blueprint.tangle.tools. Approving.