feat(api): add health readiness endpoint

[Vann-Dev]

Summary

• Add unauthenticated GET /api/health with safe app/database readiness JSON.
• Return HTTP 200 when the Prisma DB ping succeeds and HTTP 503 with degraded status when it fails.
• Document Docker/local smoke check usage and production monitoring semantics in README.

Checks

• corepack pnpm lint
• DATABASE_URL=postgresql://user:pass@localhost:5432/db?schema=public corepack pnpm typecheck
• DATABASE_URL=postgresql://user:pass@localhost:5432/db?schema=public corepack pnpm build

Note: build emits existing Next.js warning that middleware convention is deprecated in favor of proxy.

[vercel]

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Project	Deployment	Actions	Updated (UTC)
agent-bridge	Ready	Preview, Comment	May 12, 2026 2:03am