fix: add blocklist filter to /prices/markets endpoint

[0x-SquidSol]

Summary

• Issue: /prices/markets returned price data for blocked slabs (phantom/test markets) while /markets and /funding/global properly filter them via isBlockedSlab().
• Fix: Adds the same isBlockedSlab() filter for consistency.

Test plan

• vitest run passes (186/186 tests)

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 4bf4683b-3f79-4f46-ad7b-847114ed4d6c

📥 Commits

Reviewing files that changed from the base of the PR and between fb94c29 and 0781c81.

📒 Files selected for processing (1)

• src/routes/prices.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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