feat: complete agency site build (Phases 1-7)

Full Next.js 16 + Payload CMS 3.x agency site with:
- Homepage: Hero, TrustBar, Services, Configurator wizard, Process,
  Selected Works, Philosophy, CTA Banner
- Sub-pages: /services (3 pillars + AI Layer), /work/[slug] (case
  studies), /about (philosophy + story)
- Configurator: 3-step wizard with AI brief generation API
- i18n: Full EN/FR bilingual with next-intl
- Design system: Cormorant Garamond + Inter, celestial blue palette,
  glassmorphism nav, Framer Motion animations
- Payload CMS collections: Projects, Services, Submissions, Media

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.env.example

@@ -0,0 +1,22 @@
+# Database
+DATABASE_URI=postgresql://postgres:postgres@localhost:5432/letsbe
+
+# Payload CMS
+PAYLOAD_SECRET=your-secret-key-here-change-in-production
+
+# OpenRouter (for AI brief generation)
+OPENROUTER_API_KEY=your-openrouter-api-key
+
+# Email (Poste.io SMTP)
+SMTP_HOST=mail.letsbe.biz
+SMTP_PORT=587
+SMTP_USER=hello@letsbe.biz
+SMTP_PASS=your-smtp-password
+SMTP_FROM=hello@letsbe.biz
+ADMIN_EMAIL=hello@letsbe.biz
+
+# Cal.com
+NEXT_PUBLIC_CALCOM_URL=https://cal.letsbe.biz
+
+# Site
+NEXT_PUBLIC_SITE_URL=https://letsbe.biz