fix(validateSlab): validate BLOCKED_MARKET_ADDRESSES entries as base58 pubkeys

[6figpsolseeker]

Summary

• Entries from the BLOCKED_MARKET_ADDRESSES env var were split and trimmed but never validated as base58 Solana pubkeys. A typo or truncated value would silently never match any slab, defeating the runtime blocklist without any warning.
• Adds a PublicKey parse check at module load that mirrors the pattern applied to ip-blocklist.ts in PR fix(ip-blocklist): normalize and validate exact-IP entries #142: invalid entries are dropped and logged at warn level so operators notice immediately.

Test plan

• New test: sets BLOCKED_MARKET_ADDRESSES to a mix of valid + invalid entries, re-imports the module, asserts valid entries block and invalid entries are dropped
• npx vitest run tests/middleware/validateSlab.test.ts — 15/15 passing
• Full suite: 189/190 passing (the 1 failure is a pre-existing tests/routes/prices.test.ts issue on main, unrelated)
• npx tsc --noEmit — clean

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: a7603c4b-1931-4d6b-9c69-fde8c5057100

📥 Commits

Reviewing files that changed from the base of the PR and between fb4d0f7 and e987be4.

📒 Files selected for processing (2)

• src/middleware/validateSlab.ts
• tests/middleware/validateSlab.test.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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