First production release of the personal portfolio.

• Personalized content, branding (PS logo, profile assets), and bilingual UI (EN default, PT available).
• About section and refined hero/skills/experience/projects/contact flow.
• Shell-style ambient background; removed duplicate decorative layers from sections.
• Contact form via Resend (/api/contact), with clearer errors and optional CONTACT_INBOX_EMAIL for sandbox.
• SEO/metadata aligned with English defaults (tab title: Backend Engineer); updated manifest.json and README.
• Removed custom Supabase analytics and related APIs; dropped unused tracking wrappers.
  Deploy: configure NEXT_PUBLIC_SITE_URL, RESEND_API_KEY, and (optional) GITHUB_TOKEN / domain verification on Resend for production email.