Refactor for i18n, CMS integration, and project slugs; enhance admin & analytics

Co-authored-by: dennis <dennis@konkol.net>

app/api/projects/[id]/translation/route.ts

@@ -0,0 +1,71 @@
+import { NextRequest, NextResponse } from "next/server";
+import { prisma } from "@/lib/prisma";
+import { requireSessionAuth } from "@/lib/auth";
+
+export async function GET(
+  request: NextRequest,
+  { params }: { params: Promise<{ id: string }> },
+) {
+  const isAdminRequest = request.headers.get("x-admin-request") === "true";
+  if (!isAdminRequest) return NextResponse.json({ error: "Admin access required" }, { status: 403 });
+  const authError = requireSessionAuth(request);
+  if (authError) return authError;
+
+  const { id: idParam } = await params;
+  const id = parseInt(idParam, 10);
+  if (!Number.isFinite(id)) return NextResponse.json({ error: "Invalid project id" }, { status: 400 });
+
+  const { searchParams } = new URL(request.url);
+  const locale = searchParams.get("locale") || "en";
+
+  const translation = await prisma.projectTranslation.findFirst({
+    where: { projectId: id, locale },
+  });
+
+  return NextResponse.json({ translation });
+}
+
+export async function PUT(
+  request: NextRequest,
+  { params }: { params: Promise<{ id: string }> },
+) {
+  const isAdminRequest = request.headers.get("x-admin-request") === "true";
+  if (!isAdminRequest) return NextResponse.json({ error: "Admin access required" }, { status: 403 });
+  const authError = requireSessionAuth(request);
+  if (authError) return authError;
+
+  const { id: idParam } = await params;
+  const id = parseInt(idParam, 10);
+  if (!Number.isFinite(id)) return NextResponse.json({ error: "Invalid project id" }, { status: 400 });
+
+  const body = (await request.json()) as {
+    locale?: string;
+    title?: string;
+    description?: string;
+  };
+
+  const locale = body.locale || "en";
+  const title = body.title?.trim();
+  const description = body.description?.trim();
+
+  if (!title || !description) {
+    return NextResponse.json({ error: "title and description are required" }, { status: 400 });
+  }
+
+  const saved = await prisma.projectTranslation.upsert({
+    where: { projectId_locale: { projectId: id, locale } },
+    create: {
+      projectId: id,
+      locale,
+      title,
+      description,
+    },
+    update: {
+      title,
+      description,
+    },
+  });
+
+  return NextResponse.json({ translation: saved });
+}
+