feat: SEO altyapısı + admin editör/favicon/menü düzeltmeleri

Admin & site:
- @tailwindcss/typography ekle → editör ve yayın içeriği prose stilleriyle düzgün render
- Favicon: logo.png'den kare app/icon.png + apple-icon.png, varsayılan favicon.ico kaldırıldı
- SEO keyword: seo_settings.default_keywords + seo_pages.keywords + buildMetadata birleştirme
- Menü düzeni admin'den yönetilebilir (site_settings.nav_items, /admin/menu, header & mobile-menu refactor)

SEO:
- app/sitemap.ts (statik + blog/hizmet/çözüm/proje/sektör dinamik)
- app/robots.ts (sitemap ref + /admin,/api disallow)
- app/llms.txt/route.ts (AI/LLM rehberi)
- BlogPosting/Service/FAQ/Article JSON-LD wire (json-ld bileşenleri bağlandı)
- buildMetadata: blog/proje OG görseli + type article + keywords birleştirme düzeltmesi
- blog tags → keyword

components/header.tsx

@@ -3,6 +3,8 @@ import Link from "next/link";
 import { ChevronDown, Phone } from "lucide-react";
 import { getSiteSettings, listServices } from "@/lib/data";
 import { siteConfig } from "@/lib/site-config";
+import { resolveNavItems } from "@/lib/nav";
+import type { ServiceRow } from "@/lib/types";
 import { HeaderScrollEffect } from "@/components/header-scroll";
 import { MobileMenu } from "@/components/mobile-menu";
 
@@ -22,6 +24,9 @@ export async function Header() {
     ["seo-dijital-pazarlama", "sosyal-medya-yonetimi", "dijital-reklam"].includes(s.slug),
   );
 
+  // Admin'den düzenlenebilir üst menü düzeni
+  const navItems = resolveNavItems(settings?.nav_items).filter((i) => i.visible);
+
   return (
     <>
       <HeaderScrollEffect />
@@ -50,98 +55,26 @@ export async function Header() {
                 </span>
               </Link>
 
-              {/* Col 2 — Desktop nav */}
+              {/* Col 2 — Desktop nav (sıra admin'den yönetilir) */}
               <div className="hidden items-center gap-0.5 lg:flex">
-                <Link
-                  href="/"
-                  className="inline-flex h-9 items-center justify-center whitespace-nowrap rounded-lg px-3.5 text-sm font-medium text-gray-600 transition-colors hover:bg-gray-100 hover:text-gray-900"
-                >
-                  Anasayfa
-                </Link>
-
-                {/* Hizmetler mega menu */}
-                <div className="group relative">
-                  <button
-                    type="button"
-                    className="inline-flex h-9 items-center justify-center gap-1 whitespace-nowrap rounded-lg px-3.5 text-sm font-medium text-gray-600 transition-colors hover:bg-gray-100 hover:text-gray-900"
-                  >
-                    Hizmetler
-                    <ChevronDown className="size-3 transition-transform duration-200 group-hover:rotate-180" />
-                  </button>
-                  <div className="pointer-events-none invisible absolute left-1/2 top-full z-50 w-[480px] -translate-x-1/2 pt-2 opacity-0 transition-all duration-150 ease-out group-hover:pointer-events-auto group-hover:visible group-hover:opacity-100">
-                    <div className="translate-y-1 rounded-2xl border border-gray-100 bg-white p-4 shadow-xl transition-transform duration-150 group-hover:translate-y-0">
-                      <div className="grid grid-cols-2 gap-x-3">
-                        <div>
-                          <p className="px-3 pb-1.5 text-[10px] font-semibold uppercase tracking-wider text-gray-400">
-                            Web & Yazılım
-                          </p>
-                          {webServices.map((s) => (
-                            <Link
-                              key={s.slug}
-                              href={`/hizmetler/${s.slug}`}
-                              className="flex items-center gap-3 rounded-xl px-3 py-2.5 text-sm text-gray-700 transition-colors hover:bg-blue-50 hover:text-[var(--navy)]"
-                            >
-                              {s.title}
-                            </Link>
-                          ))}
-                        </div>
-                        <div>
-                          <p className="px-3 pb-1.5 text-[10px] font-semibold uppercase tracking-wider text-gray-400">
-                            Dijital Pazarlama
-                          </p>
-                          {marketingServices.map((s) => (
-                            <Link
-                              key={s.slug}
-                              href={`/hizmetler/${s.slug}`}
-                              className="flex items-center gap-3 rounded-xl px-3 py-2.5 text-sm text-gray-700 transition-colors hover:bg-blue-50 hover:text-[var(--navy)]"
-                            >
-                              {s.title}
-                            </Link>
-                          ))}
-                        </div>
-                      </div>
-                      <div className="mt-3 border-t border-gray-100 pt-3">
-                        <Link
-                          href="/hizmetler"
-                          className="block rounded-xl px-3 py-2 text-center text-xs font-semibold text-[var(--navy)] hover:bg-blue-50"
-                        >
-                          Tüm hizmetleri gör →
-                        </Link>
-                      </div>
-                    </div>
-                  </div>
-                </div>
-
-                <Link
-                  href="/cozumler"
-                  className="inline-flex h-9 items-center justify-center whitespace-nowrap rounded-lg px-3.5 text-sm font-medium text-gray-600 transition-colors hover:bg-gray-100 hover:text-gray-900"
-                >
-                  Çözümler
-                </Link>
-                <Link
-                  href="/projeler"
-                  className="inline-flex h-9 items-center justify-center whitespace-nowrap rounded-lg px-3.5 text-sm font-medium text-gray-600 transition-colors hover:bg-gray-100 hover:text-gray-900"
-                >
-                  Projeler
-                </Link>
-                <Link
-                  href="/blog"
-                  className="inline-flex h-9 items-center justify-center whitespace-nowrap rounded-lg px-3.5 text-sm font-medium text-gray-600 transition-colors hover:bg-gray-100 hover:text-gray-900"
-                >
-                  Blog
-                </Link>
-                <Link
-                  href="/hakkimizda"
-                  className="inline-flex h-9 items-center justify-center whitespace-nowrap rounded-lg px-3.5 text-sm font-medium text-gray-600 transition-colors hover:bg-gray-100 hover:text-gray-900"
-                >
-                  Hakkımızda
-                </Link>
-                <Link
-                  href="/iletisim"
-                  className="inline-flex h-9 items-center justify-center whitespace-nowrap rounded-lg px-3.5 text-sm font-medium text-gray-600 transition-colors hover:bg-gray-100 hover:text-gray-900"
-                >
-                  İletişim
-                </Link>
+                {navItems.map((item) =>
+                  item.mega ? (
+                    <ServicesMegaMenu
+                      key={item.key}
+                      label={item.label}
+                      webServices={webServices}
+                      marketingServices={marketingServices}
+                    />
+                  ) : (
+                    <Link
+                      key={item.key}
+                      href={item.href}
+                      className="inline-flex h-9 items-center justify-center whitespace-nowrap rounded-lg px-3.5 text-sm font-medium text-gray-600 transition-colors hover:bg-gray-100 hover:text-gray-900"
+                    >
+                      {item.label}
+                    </Link>
+                  ),
+                )}
               </div>
 
               {/* Col 3 — CTA */}
@@ -176,6 +109,7 @@ export async function Header() {
 
                 {/* Mobil menü (hamburger) — sadece < lg */}
                 <MobileMenu
+                  navItems={navItems}
                   services={services.map((s) => ({ slug: s.slug, title: s.title }))}
                   phone={phone}
                   phoneRaw={phoneRaw}
@@ -188,3 +122,67 @@ export async function Header() {
     </>
   );
 }
+
+function ServicesMegaMenu({
+  label,
+  webServices,
+  marketingServices,
+}: {
+  label: string;
+  webServices: ServiceRow[];
+  marketingServices: ServiceRow[];
+}) {
+  return (
+    <div className="group relative">
+      <button
+        type="button"
+        className="inline-flex h-9 items-center justify-center gap-1 whitespace-nowrap rounded-lg px-3.5 text-sm font-medium text-gray-600 transition-colors hover:bg-gray-100 hover:text-gray-900"
+      >
+        {label}
+        <ChevronDown className="size-3 transition-transform duration-200 group-hover:rotate-180" />
+      </button>
+      <div className="pointer-events-none invisible absolute left-1/2 top-full z-50 w-[480px] -translate-x-1/2 pt-2 opacity-0 transition-all duration-150 ease-out group-hover:pointer-events-auto group-hover:visible group-hover:opacity-100">
+        <div className="translate-y-1 rounded-2xl border border-gray-100 bg-white p-4 shadow-xl transition-transform duration-150 group-hover:translate-y-0">
+          <div className="grid grid-cols-2 gap-x-3">
+            <div>
+              <p className="px-3 pb-1.5 text-[10px] font-semibold uppercase tracking-wider text-gray-400">
+                Web & Yazılım
+              </p>
+              {webServices.map((s) => (
+                <Link
+                  key={s.slug}
+                  href={`/hizmetler/${s.slug}`}
+                  className="flex items-center gap-3 rounded-xl px-3 py-2.5 text-sm text-gray-700 transition-colors hover:bg-blue-50 hover:text-[var(--navy)]"
+                >
+                  {s.title}
+                </Link>
+              ))}
+            </div>
+            <div>
+              <p className="px-3 pb-1.5 text-[10px] font-semibold uppercase tracking-wider text-gray-400">
+                Dijital Pazarlama
+              </p>
+              {marketingServices.map((s) => (
+                <Link
+                  key={s.slug}
+                  href={`/hizmetler/${s.slug}`}
+                  className="flex items-center gap-3 rounded-xl px-3 py-2.5 text-sm text-gray-700 transition-colors hover:bg-blue-50 hover:text-[var(--navy)]"
+                >
+                  {s.title}
+                </Link>
+              ))}
+            </div>
+          </div>
+          <div className="mt-3 border-t border-gray-100 pt-3">
+            <Link
+              href="/hizmetler"
+              className="block rounded-xl px-3 py-2 text-center text-xs font-semibold text-[var(--navy)] hover:bg-blue-50"
+            >
+              Tüm hizmetleri gör →
+            </Link>
+          </div>
+        </div>
+      </div>
+    </div>
+  );
+}