Wire production Hyperdrive and verify Bing MCP end to end

[ClaudiaFang]

Follow-up to #3 / PR #4 after infra-config production Hyperdrive rollout.

Target branch: feat/production-hyperdrive-e2e

Scope

• Replace the placeholder ANALYTICS_DB Hyperdrive ID in wrangler.jsonc with the production Terraform-managed Hyperdrive ID.
• Deploy anas-mcp without introducing any Bing API credential or direct Bing network call.
• Verify bing_list_sites against production data.
• Verify bing_search_performance for both query and page dimensions.
• Verify freshness metadata (fetchedAt, dataThrough, stale) and normalized database error handling.
• Keep Hyperdrive credentials owned by Cloudflare Hyperdrive; do not copy DB credentials into Worker secrets/config.

Production Hyperdrive

• Name: anas-mcp-windmill-pipeline
• ID: 8677c23af5c14b43a460169f2f2cc93f

Acceptance criteria

• wrangler.jsonc no longer contains the all-zero Hyperdrive placeholder.
• npm run check passes.
• Worker deploy succeeds.
• bing_list_sites returns the latest successful persisted site dataset.
• bing_search_performance works for query and page dimensions.
• freshness metadata is present and semantically correct.
• no direct Bing provider secret/network dependency is reintroduced.
• production E2E results are recorded in the PR.

Refs #3.