fix(settings): FMP Test key uses EquitySearch, matching Intrinio

[bishallllllll]

FMP Test-key endpoint: use EquitySearch (matches Intrinio)

Settings → Market Data → Advanced: the "Test FMP key" button probes a key via the Test-key endpoint. FMP was using EquityScreener {limit:1} while Intrinio already uses EquitySearch {query:'AAPL', limit:1}. This makes FMP consistent (and the screener endpoint is a heavier call for a key probe).

• src/webui/routes/config.ts — one-line change in TEST_ENDPOINTS; EquitySearch is a registered FMP fetcher (packages/opentypebb/src/providers/fmp/index.ts:135)
• Verified: root npx tsc --noEmit clean
• Suggested labels: area:settings, area:market-data

[vercel]

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[Copilot]

Pull request overview

This PR updates the Settings → Market Data → Advanced “Test FMP key” probe to use the lighter EquitySearch model (aligned with Intrinio’s probe) instead of the heavier EquityScreener call.

Changes:

• Switch FMP test-key endpoint model from EquityScreener to EquitySearch.
• Provide a concrete query (AAPL) for the FMP EquitySearch probe to validate credentials.

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[bishallllllll]

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