feat: admin paneli + blog + testimonials + SEO yöneticisi

Backend altyapısı:
- 4 yeni Appwrite tablosu: blog_posts, testimonials, seo_pages, seo_settings
- Appwrite Storage bucket: kovak-yazilim-media (görsel yüklemeleri)
- Appwrite Auth ile session cookie tabanlı koruma

Admin paneli (/admin):
- Login akışı (email/password) + protected layout
- Dashboard: sayım kartları + hızlı aksiyonlar
- Blog CRUD: markdown content, kapak görseli, draft/published, SEO alanları
- Services CRUD: lucide ikon seçici
- Projects CRUD: teknoloji etiketleri, live URL
- Testimonials CRUD: puanlama
- SEO yöneticisi: global ayarlar + sayfa bazlı override
- Mesaj inbox: status filtreleme + güncelleme
- Medya kütüphanesi: Appwrite Storage upload/delete

Public:
- /blog ve /blog/[slug] sayfaları (markdown render)
- Anasayfaya Testimonials bölümü
- Tüm public sayfalarda generateMetadata + seo_pages override
- Header'a Blog linki

Route yapısı:
- app/(site)/ — public site, Header/Footer ortak
- app/admin/login — auth dışı
- app/admin/(protected)/ — requireUser() korumalı

23 route üretiliyor, public static, admin dynamic.

app/admin/(protected)/projeler/form.tsx

@@ -0,0 +1,81 @@
+import { Save } from "lucide-react";
+import {
+  Checkbox,
+  Field,
+  FormActions,
+  FormShell,
+  GhostLink,
+  PageHeader,
+  PrimaryButton,
+  Textarea,
+} from "@/components/admin/form";
+import { saveProject } from "@/lib/admin-actions";
+import type { ProjectRow } from "@/lib/types";
+
+export function ProjectForm({ project }: { project?: ProjectRow }) {
+  return (
+    <div>
+      <PageHeader
+        title={project ? "Projeyi düzenle" : "Yeni proje"}
+        backHref="/admin/projeler"
+      />
+      <form action={saveProject}>
+        {project && <input type="hidden" name="id" value={project.$id} />}
+        <FormShell>
+          <div className="grid gap-5 md:grid-cols-2">
+            <Field label="Başlık" name="title" required defaultValue={project?.title} />
+            <Field label="Slug" name="slug" defaultValue={project?.slug} />
+            <Field label="Kategori" name="category" defaultValue={project?.category} />
+            <Field
+              label="Yıl"
+              name="year"
+              type="number"
+              defaultValue={project?.year ?? new Date().getFullYear()}
+            />
+            <Field
+              label="Görsel URL"
+              name="image_url"
+              type="url"
+              defaultValue={project?.image_url}
+            />
+            <Field
+              label="Canlı URL"
+              name="live_url"
+              type="url"
+              defaultValue={project?.live_url}
+            />
+            <Field
+              label="Teknolojiler"
+              name="technologies"
+              defaultValue={project?.technologies?.join(", ")}
+              placeholder="Next.js, Appwrite, Tailwind"
+              help="Virgülle ayırın."
+            />
+          </div>
+          <div className="mt-5">
+            <Textarea
+              label="Açıklama"
+              name="description"
+              required
+              defaultValue={project?.description}
+              rows={6}
+            />
+          </div>
+          <div className="mt-5">
+            <Checkbox
+              label="Öne çıkar (Anasayfada göster)"
+              name="featured"
+              defaultChecked={project?.featured ?? false}
+            />
+          </div>
+          <FormActions>
+            <GhostLink href="/admin/projeler">İptal</GhostLink>
+            <PrimaryButton>
+              <Save className="size-4" /> Kaydet
+            </PrimaryButton>
+          </FormActions>
+        </FormShell>
+      </form>
+    </div>
+  );
+}