Backend-hosted financial pages produce 503 console/network errors for embedding status

[simplerjiang]

• Found by: Playwright Edge source UI smoke.
• Impact: Browser validation reports console errors on normal navigation to financial pages.
• Repro:
  1. Build frontend: npm.cmd --prefix .\frontend run build.
  2. Start source backend on an available port.
  3. Open backend-hosted frontend and click main tabs through financial center.
• Expected: Known degraded embedding capability should be represented without browser console/network errors.
• Actual: Playwright captured two errors: 503 /api/stocks/financial/embedding/status.
• Claim: Assign financial/frontend owner.
• Repair: Return a non-error degraded contract or suppress expected 503 from normal console flow.
• Verification: Browser navigation shows no console errors and displays degraded embedding state clearly.