Add i18n for auth flows, SEO assets, site metadata and AuthShell component

[reqmdev]

Motivation

• Provide English and Turkish localized auth flows and copy across login, signup, reset and forgot-password experiences.
• Centralize the auth page layout into a reusable AuthShell to reduce duplication and support per-locale rendering.
• Improve SEO and social sharing by adding canonical metadata, OpenGraph/Twitter images and site URL normalization.
• Add public verification and crawl assets so Search Console and crawlers can index the intended pages.

Description

• Introduced AuthShell component and refactored auth layout to use it, with locale-aware copy and steps for tr and en locales.
• Added locale-specific auth pages under src/app/en/(auth) and made existing auth pages pass locale down to forms and components; updated LoginForm, SignupForm, ForgotPasswordForm, ResetPasswordForm, OAuthButtons, and bot-protection/recaptcha UI to be locale-aware.
• Added site metadata and social previews in src/app/layout.tsx, including openGraph, twitter, robots and a nicer metadata.description and title; wired Vercel insights scripts.
• Added SEO/public assets: public/robots.txt, public/sitemap.xml, and public/google9300d3df9e5b7d46.html, plus docs/seo-launch-checklist.md.
• Implemented a small src/lib/site-url.ts utility to normalize the site URL and build absolute image/URL values, and adjusted footer path localization logic to handle auth routes and /en prefix behavior.

Testing

• Ran TypeScript type checking (pnpm tsc) and it completed successfully.
• Performed a local Next.js production build (next build) to validate the server/client bundles and metadata generation, and the build succeeded.
• Verified that the new public assets (robots.txt, sitemap.xml, google*.html) are present in public/ and referenced by robots/metadata configuration.

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Codex Task

[vercel]

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Project	Deployment	Actions	Updated (UTC)
vultkey	Ready	Preview, Comment	May 30, 2026 10:58pm