docs: close code and documentation audit gaps

[jonathanperis]

Summary

• Add an API Reference page covering request/response payloads, validation rules, status codes, and the current over-limit debit behavior
• Update README and Pages docs to point at the canonical Pages documentation and document Astro 6.4/Sätteri docs pipeline
• Clarify API-vs-PostgreSQL responsibilities, benchmark report methodology, CI build matrix, and report archive semantics
• Align NGINX config comments and prod README with documented behavior

Validation

• NODE_ENV=production bun run build
• bun run lint
• Generated docs link check: 0 missing internal links

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: ccda8f7c-d865-4b0c-abfa-e6da034a0559

📥 Commits

Reviewing files that changed from the base of the PR and between f55dffa and e74f122.

📒 Files selected for processing (15)

• README.md
• docs/README.md
• docs/src/pages/docs/[...slug].astro
• docs/src/pages/reports/index.astro
• docs/src/sidebar.config.ts
• docs/wiki/api-reference.md
• docs/wiki/architecture.md
• docs/wiki/challenge.md
• docs/wiki/ci-cd-pipeline.md
• docs/wiki/getting-started.md
• docs/wiki/home.md
• docs/wiki/performance.md
• nginx.conf
• prod/README.md
• prod/conf/nginx.conf

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/close-documentation-gaps

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