feat: redesign homepage with triptych process + admin image management

- Redesign Hero section with new copy focused on the triptych offering
- Add Process component (replaces System) with zigzag layout for 3 pillars:
  Google Maps reviews, managed Facebook, converting website
- Redesign AboutMe with orange background and stats row
- Add admin panel for managing site image URLs (replaces Sanity dependency)
- Create site_images API routes and Supabase-backed storage with defaults
- Update FAQ to reference built-in admin panel
- Add site_images table type to database types
- Pass images prop through homepage components

https://claude.ai/code/session_01V8YAjpqRQ3bfBYsABYsEgo

app/api/admin/site-images/route.ts

@@ -0,0 +1,96 @@
+import { NextRequest, NextResponse } from "next/server";
+import { createClient, createAdminClient } from "@/lib/supabase/server";
+import { DEFAULT_IMAGES, updateSiteImage } from "@/lib/site-images";
+import type { Profile } from "@/types/database.types";
+
+interface SiteImageRow {
+  key: string;
+  url: string;
+  label: string | null;
+  updated_at: string;
+}
+
+async function checkAdmin() {
+  const supabase = await createClient();
+  const {
+    data: { user },
+  } = await supabase.auth.getUser();
+  if (!user) return false;
+
+  const adminClient = createAdminClient();
+  const { data: profile } = await adminClient
+    .from("profiles")
+    .select("is_admin")
+    .eq("id", user.id)
+    .single();
+
+  return (profile as Pick<Profile, "is_admin"> | null)?.is_admin === true;
+}
+
+// GET - Récupérer toutes les images
+export async function GET() {
+  const isAdmin = await checkAdmin();
+  if (!isAdmin) {
+    return NextResponse.json({ error: "Non autorisé" }, { status: 401 });
+  }
+
+  try {
+    const supabase = createAdminClient();
+    const { data } = await supabase.from("site_images").select("*");
+    const rows = (data ?? []) as unknown as SiteImageRow[];
+
+    // Merge defaults avec les valeurs en base
+    const images = Object.entries(DEFAULT_IMAGES).map(([key, def]) => {
+      const saved = rows.find((d) => d.key === key);
+      return {
+        key,
+        url: saved?.url || def.url,
+        label: def.label,
+        updated_at: saved?.updated_at || null,
+      };
+    });
+
+    return NextResponse.json({ images });
+  } catch {
+    // Si la table n'existe pas, retourner les defaults
+    const images = Object.entries(DEFAULT_IMAGES).map(([key, def]) => ({
+      key,
+      url: def.url,
+      label: def.label,
+      updated_at: null,
+    }));
+    return NextResponse.json({ images });
+  }
+}
+
+// PUT - Mettre à jour une image
+export async function PUT(request: NextRequest) {
+  const isAdmin = await checkAdmin();
+  if (!isAdmin) {
+    return NextResponse.json({ error: "Non autorisé" }, { status: 401 });
+  }
+
+  const body = await request.json();
+  const { key, url } = body;
+
+  if (!key || !url) {
+    return NextResponse.json({ error: "key et url requis" }, { status: 400 });
+  }
+
+  // Vérifier que l'URL est valide
+  try {
+    new URL(url);
+  } catch {
+    return NextResponse.json({ error: "URL invalide" }, { status: 400 });
+  }
+
+  const success = await updateSiteImage(key, url);
+  if (!success) {
+    return NextResponse.json(
+      { error: "Erreur lors de la sauvegarde. Vérifiez que la table site_images existe dans Supabase." },
+      { status: 500 }
+    );
+  }
+
+  return NextResponse.json({ success: true });
+}