feat(landing): migrate to vinext and fix deploy regressions

[DIYgod]

Description

This PR migrates apps/landing from Next.js/OpenNext to vinext, including Vite config, worker entry, and Wrangler setup for Cloudflare.
It replaces middleware with a proxy implementation that handles locale rewrites for normal and .rsc requests while bypassing static/internal routes.
It hardens locale resolution in layout, download metadata, and next-intl request config, fixing wrong-language and not-found regressions in dev deploy.
It also removes the server action for GitHub stars and switches to client-side fetch to avoid RSC action errors that could blank the first page render.

PR Type

• Feature
• Bugfix
• Hotfix
• Other (please describe):

Screenshots (if UI change)

N/A

Demo Video (if new feature)

N/A

Linked Issues

N/A

Additional context

Validated with pnpm --filter @follow/landing typecheck and pnpm --filter @follow/landing build.

Changelog

• I have updated the changelog/next.md with my changes.

[safedep]

SafeDep Report Summary

Package Details

Package	Malware	Vulnerability	Risky License	Report
@cloudflare/vite-plugin @ 1.25.5 apps/landing/package.json pnpm-lock.yaml pnpm-lock.yaml				🔗
@cloudflare/workerd-darwin-64 @ 1.20260302.0 pnpm-lock.yaml				🔗
@cloudflare/workerd-darwin-arm64 @ 1.20260302.0 pnpm-lock.yaml				🔗
@cloudflare/workerd-linux-64 @ 1.20260302.0 pnpm-lock.yaml				🔗
@cloudflare/workerd-linux-arm64 @ 1.20260302.0 pnpm-lock.yaml				🔗
@cloudflare/workerd-windows-64 @ 1.20260302.0 pnpm-lock.yaml				🔗
@resvg/resvg-wasm @ 2.4.0 pnpm-lock.yaml				🔗
@rolldown/pluginutils @ 1.0.0-rc.5 pnpm-lock.yaml				🔗
@unpic/core @ 1.0.3 pnpm-lock.yaml				🔗
@unpic/react @ 1.0.2 pnpm-lock.yaml				🔗
@vercel/og @ 0.8.6 pnpm-lock.yaml				🔗
@vitejs/plugin-rsc @ 0.5.21 apps/landing/package.json pnpm-lock.yaml pnpm-lock.yaml				🔗
acorn-loose @ 8.5.2 pnpm-lock.yaml				🔗
css-gradient-parser @ 0.0.16 pnpm-lock.yaml				🔗
is-reference @ 3.0.3 pnpm-lock.yaml				🔗
miniflare @ 4.20260302.0 pnpm-lock.yaml				🔗
periscopic @ 4.0.2 pnpm-lock.yaml				🔗
react-server-dom-webpack @ 19.2.4 pnpm-lock.yaml				🔗
rsc-html-stream @ 0.0.7 pnpm-lock.yaml				🔗
satori @ 0.16.0 pnpm-lock.yaml				🔗
srvx @ 0.11.8 pnpm-lock.yaml				🔗
turbo-stream @ 3.2.0 pnpm-lock.yaml				🔗
unpic @ 4.2.2 pnpm-lock.yaml				🔗
vinext @ 0.0.9 apps/landing/package.json pnpm-lock.yaml pnpm-lock.yaml				🔗
vite @ 7.3.1 apps/landing/package.json pnpm-lock.yaml				🔗
vitefu @ 1.1.2 pnpm-lock.yaml				🔗
workerd @ 1.20260302.0 pnpm-lock.yaml				🔗
wrangler @ 4.68.1 apps/landing/package.json pnpm-lock.yaml pnpm-lock.yaml				🔗
zimmerframe @ 1.1.4 pnpm-lock.yaml				🔗

_{This report is generated by SafeDep Github App}

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