[CI/CD] Standalone Next.js Dockerfile for Kubernetes/Cloud Run deployment

[nanaf6203-bit]

Problem Statement

Deploy docs target Vercel. There's no Dockerfile, which prevents Kubernetes / Cloud Run / ECS deployment.

Acceptance Criteria

• A multi-stage Dockerfile producing node:20-slim standalone image
• Build outputs to next.config.ts output: 'standalone'
• Run on port 3000; non-root user
• Documented in docs/deployment.md

Implementation Notes

Enable output: 'standalone' in next.config.ts. Use multi-stage with pnpm install for reproducible cache.

Files Likely Affected

• Dockerfile (new)
• next.config.ts
• docs/deployment.md

Difficulty / Effort

• Difficulty: Moderate
• Effort: T-Shirt M

Labels

ci-cd, priority:medium, area:infrastructure

[khanavi272-spec]

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[a-malik-gh]

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