feat: redirect index pages to first child when no index exists

[rsbh]

Summary

• /apis redirects to first API endpoint instead of showing generic landing
• Content root (e.g., /docs) redirects to first nested page when index.md is missing
• Regular 404s still show NotFound page — only content roots redirect

Test plan

• Visit /apis — redirects to first API endpoint
• Visit /docs without index.md — redirects to first docs page
• Visit /docs/nonexistent — shows 404
• Visit /apis/invalid/path — shows empty/null (no match)
• Normal page navigation still works

🤖 Generated with Claude Code

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Project	Deployment	Actions	Updated (UTC)
chronicle	Ready	Preview, Comment	May 13, 2026 4:50am

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 3e52498f-28b6-4871-acb4-761a9136f77a

📥 Commits

Reviewing files that changed from the base of the PR and between 4b4857e and baa34fc.

📒 Files selected for processing (3)

• packages/chronicle/src/lib/api-routes.ts
• packages/chronicle/src/pages/ApiPage.tsx
• packages/chronicle/src/pages/DocsPage.tsx

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/landing-redirect

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