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>

src/payload/payload.config.ts

@@ -0,0 +1,44 @@
+import { buildConfig } from 'payload'
+import { postgresAdapter } from '@payloadcms/db-postgres'
+import { lexicalEditor } from '@payloadcms/richtext-lexical'
+import sharp from 'sharp'
+import path from 'path'
+import { fileURLToPath } from 'url'
+
+import { Projects } from './collections/Projects'
+import { Services } from './collections/Services'
+import { Submissions } from './collections/Submissions'
+import { Media } from './collections/Media'
+import { Users } from './collections/Users'
+
+const filename = fileURLToPath(import.meta.url)
+const dirname = path.dirname(filename)
+
+export default buildConfig({
+  admin: {
+    user: Users.slug,
+    importMap: {
+      baseDir: path.resolve(dirname, '..'),
+    },
+  },
+  collections: [Users, Media, Projects, Services, Submissions],
+  editor: lexicalEditor(),
+  secret: process.env.PAYLOAD_SECRET || 'CHANGE-ME-IN-PRODUCTION',
+  typescript: {
+    outputFile: path.resolve(dirname, '../payload-types.ts'),
+  },
+  db: postgresAdapter({
+    pool: {
+      connectionString: process.env.DATABASE_URI || 'postgresql://postgres:postgres@localhost:5432/letsbe',
+    },
+  }),
+  sharp,
+  localization: {
+    locales: [
+      { label: 'English', code: 'en' },
+      { label: 'Français', code: 'fr' },
+    ],
+    defaultLocale: 'en',
+    fallback: true,
+  },
+})