feat(cms): add storage based website content management

app/api/admin/content/route.ts

@@ -0,0 +1,27 @@
+import { NextResponse } from "next/server";
+import { requireAdminSession } from "@/lib/admin/auth";
+import { getAllContent, saveContent } from "@/lib/content/service";
+import type { ContentDocuments, ContentKey } from "@/lib/content/types";
+
+const keys: ContentKey[] = ["home", "services", "radio-service", "about", "contact", "settings"];
+
+function isContentKey(value: unknown): value is ContentKey {
+  return typeof value === "string" && keys.includes(value as ContentKey);
+}
+
+export async function GET() {
+  if (!await requireAdminSession()) return NextResponse.json({ message: "Nicht autorisiert." }, { status: 401 });
+  return NextResponse.json({ content: await getAllContent() });
+}
+
+export async function PUT(request: Request) {
+  if (!await requireAdminSession()) return NextResponse.json({ message: "Nicht autorisiert." }, { status: 401 });
+
+  const body = await request.json() as { key?: unknown; content?: unknown };
+  if (!isContentKey(body.key) || !body.content) {
+    return NextResponse.json({ message: "Ungültige Content-Anfrage." }, { status: 400 });
+  }
+
+  const saved = await saveContent(body.key, body.content as ContentDocuments[typeof body.key]);
+  return NextResponse.json({ message: "Inhalt gespeichert.", key: body.key, content: saved });
+}

app/api/content/settings/route.ts

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+import { NextResponse } from "next/server";
+import { getContent } from "@/lib/content/service";
+
+export async function GET() {
+  const settings = await getContent("settings");
+  return NextResponse.json({ settings });
+}