refactor: collapse pages API into single handler with query slug

[rsbh]

Summary

• Replace catch-all /api/page/[...slug] with single /api/page handler
• Slug now passed as comma-separated query param: ?slug=cli,commands
• Empty/missing slug returns root page

Test plan

• GET /api/page returns root page (200)
• GET /api/page?slug=cli returns CLI page frontmatter (200)
• GET /api/page?slug=nonexistent returns 404
• Client navigation still loads pages correctly

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 88f55c5e-806a-4732-9c78-525d7462b3ab

📥 Commits

Reviewing files that changed from the base of the PR and between 752b303 and bf0f0f9.

📒 Files selected for processing (3)

• packages/chronicle/src/lib/page-context.tsx
• packages/chronicle/src/server/api/page.ts
• packages/chronicle/src/server/api/page/index.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore_pages_handler

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