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

app/sitemap.ts

@@ -0,0 +1,53 @@
+import type { MetadataRoute } from "next";
+import { siteConfig } from "@/lib/site-config";
+import {
+  listIndustries,
+  listProjects,
+  listPublishedPosts,
+  listServices,
+  listSolutions,
+} from "@/lib/data";
+
+const BASE = siteConfig.url;
+
+export default async function sitemap(): Promise<MetadataRoute.Sitemap> {
+  const [posts, services, solutions, projects, industries] = await Promise.all([
+    listPublishedPosts({ limit: 200 }),
+    listServices(),
+    listSolutions(),
+    listProjects({ limit: 200 }),
+    listIndustries(),
+  ]);
+
+  const staticRoutes: MetadataRoute.Sitemap = [
+    { url: `${BASE}/`, changeFrequency: "weekly", priority: 1 },
+    { url: `${BASE}/hizmetler`, changeFrequency: "monthly", priority: 0.9 },
+    { url: `${BASE}/cozumler`, changeFrequency: "monthly", priority: 0.9 },
+    { url: `${BASE}/projeler`, changeFrequency: "monthly", priority: 0.8 },
+    { url: `${BASE}/blog`, changeFrequency: "daily", priority: 0.8 },
+    { url: `${BASE}/hakkimizda`, changeFrequency: "yearly", priority: 0.6 },
+    { url: `${BASE}/iletisim`, changeFrequency: "yearly", priority: 0.7 },
+    { url: `${BASE}/site-analizi`, changeFrequency: "yearly", priority: 0.6 },
+    { url: `${BASE}/cerez-politikasi`, changeFrequency: "yearly", priority: 0.2 },
+  ];
+
+  const toEntry = (
+    path: string,
+    updatedAt?: string,
+    priority = 0.7,
+  ): MetadataRoute.Sitemap[number] => ({
+    url: `${BASE}${path}`,
+    lastModified: updatedAt ? new Date(updatedAt) : undefined,
+    changeFrequency: "weekly",
+    priority,
+  });
+
+  return [
+    ...staticRoutes,
+    ...posts.map((p) => toEntry(`/blog/${p.slug}`, p.$updatedAt, 0.7)),
+    ...services.map((s) => toEntry(`/hizmetler/${s.slug}`, s.$updatedAt, 0.8)),
+    ...solutions.map((s) => toEntry(`/cozumler/${s.slug}`, s.$updatedAt, 0.8)),
+    ...projects.map((p) => toEntry(`/projeler/${p.slug}`, p.$updatedAt, 0.7)),
+    ...industries.map((i) => toEntry(`/sektor/${i.slug}`, i.$updatedAt, 0.6)),
+  ];
+}