fix: resolve Google Search Console indexing issues

[GeiserX]

Summary

• Duplicate content fix: Root / now 302-redirects to /{locale} instead of internally rewriting. Google was seeing pumperly.com and pumperly.com/es as duplicate content with conflicting canonical URLs.
• Canonical fix: Every locale page now consistently declares canonical: https://pumperly.com/{locale} — no special-casing for root.
• Sitemap fix: Removed bare pumperly.com entry (it's just a redirect). Each locale URL now has full hreflang alternates including x-default.

What this fixes in Search Console

Issue	Cause	Fix
"Duplicada: el usuario no ha indicado ninguna versión canónica"	Root / and /es served same content with different canonicals	Root now redirects, canonical always points to locale URL
"Página con redirección" (×3)	Root / was in sitemap but redirects	Removed from sitemap; only indexable locale URLs listed

Test plan

• All 365 tests pass (including updated middleware tests)
• TypeScript type check passes
• After deploy: verify curl -I pumperly.com returns 302 → /es
• After deploy: verify curl -s pumperly.com/en | grep canonical shows pumperly.com/en
• Revalidate in Google Search Console after 1-2 weeks

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: a5fdc5e0-5a9c-4811-9512-287c5ced9366

📥 Commits

Reviewing files that changed from the base of the PR and between f5f25f3 and 7cf67bd.

📒 Files selected for processing (6)

• .coderabbit.yaml
• CLAUDE.md
• src/app/[locale]/layout.tsx
• src/app/sitemap.ts
• src/middleware.test.ts
• src/middleware.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/seo-indexing-canonical

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