fix(router): reuse warmed RSC on locale-prefixed hybrid routes

[james-elicx]

Summary

Aligns browser hybrid-route ownership with the runtime and CDN warm-path discovery rules introduced by the RSC prewarming stack.

• match App routes against the raw, basePath-stripped pathname so an App route such as /:locale/api/status still owns /fr/api/status
• locale-normalize only the Pages pathname
• select the Pages API versus page manifest partition from the raw pathname, so /fr/api/status is not reclassified as the unprefixed Pages API route /api/status
• preserve existing locale-normalized Pages page matching and rewrite matching

This lets Link prefetch, router.prefetch(), and soft navigation reuse the App RSC entry that deploy-time discovery warmed for locale-prefixed hybrid routes.

This is stacked on #3026.

Validation

• 173 focused tests across hybrid client ownership, Link behavior, prerender path discovery, and hybrid i18n runtime handoff
• targeted formatting, lint, and type checks
• vp run vinext#build

The API-path distinction follows Next.js' test/e2e/i18n-api-support/index.test.ts behavior for locale-prefixed /fr/api/* paths.

[pkg-pr-new]

Open in StackBlitz

npm i https://pkg.pr.new/@vinext/cloudflare@3027

npm i https://pkg.pr.new/create-vinext-app@3027

npm i https://pkg.pr.new/@vinext/types@3027

npm i https://pkg.pr.new/vinext@3027

commit: 956065f

[github-actions]

Performance benchmarks

Compared 956065f against base b88d125 using alternating same-runner rounds. Next.js was unchanged and skipped.

0 improved · 0 regressed · 6 within ±1.5%

Scenario	Framework	Baseline	Current	Change
Client bundle size (gzip)	vinext	142.0 KB	142.1 KB	⚫ +0.1%
Client entry size (gzip)	vinext	129.3 KB	129.4 KB	⚫ +0.1%
Dev server cold start	vinext	3.14 s	3.13 s	⚫ -0.3%
Production build time	vinext	3.56 s	3.58 s	⚫ +0.7%
RSC entry closure size (gzip)	vinext	116.0 KB	116.0 KB	⚫ -0.0%
Server bundle size (gzip)	vinext	197.5 KB	197.5 KB	⚫ -0.0%

View detailed results and traces

_{🟢 improvement · 🔴 regression · ⚫ change below 1.5% · paired base/head}

[james-elicx]

Superseded by consolidated PR #3040. No commits were dropped or rewritten: #3040 now contains this exact linear commit as part of #3021–#3040. Closing only the redundant draft PR.