Add XRayPDF client app with OCR routes

Introduce a new Next.js `client` app for XRayPDF: adds frontend pages (dashboard, upload, layout, Navbar, globals) and API routes for documents (upload, OCR, pixel processing, delete, list). Include Tesseract traineddata (eng.traineddata), update next.config.ts to allow native server packages and remote images, update package.json to add dependencies (canvas, sharp, tesseract.js, pdfjs-dist, multer, uuid), and update Prisma schema. Also add .gitignore entries for user uploads/results and a README describing the project and architecture.

client/src/app/api/upload/route.ts

@@ -0,0 +1,88 @@
+import { NextRequest, NextResponse } from "next/server";
+import { getServerSession } from "next-auth";
+import { authOptions } from "@/app/api/auth/[...nextauth]/route";
+import { prisma } from "@/lib/prisma";
+import { writeFile, mkdir } from "fs/promises";
+import { v4 as uuidv4 } from "uuid";
+import path from "path";
+
+const MAX_FILE_SIZE = 10 * 1024 * 1024; // 10 MB
+const MAX_DOCUMENTS = 5;
+
+export async function POST(req: NextRequest) {
+  const session = await getServerSession(authOptions);
+  if (!session?.user?.email) {
+    return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
+  }
+
+  const user = await prisma.user.findUnique({
+    where: { email: session.user.email },
+    include: { documents: { orderBy: { createdAt: "asc" } } },
+  });
+
+  if (!user) {
+    return NextResponse.json({ error: "User not found" }, { status: 404 });
+  }
+
+  const formData = await req.formData();
+  const file = formData.get("pdf") as File | null;
+
+  if (!file) {
+    return NextResponse.json({ error: "No file provided" }, { status: 400 });
+  }
+
+  if (file.size > MAX_FILE_SIZE) {
+    return NextResponse.json(
+      { error: "File exceeds 10 MB limit" },
+      { status: 400 }
+    );
+  }
+
+  if (!file.name.toLowerCase().endsWith(".pdf")) {
+    return NextResponse.json(
+      { error: "Only PDF files are accepted" },
+      { status: 400 }
+    );
+  }
+
+  // Enforce 5-document limit — delete oldest if at cap
+  if (user.documents.length >= MAX_DOCUMENTS) {
+    const oldest = user.documents[0];
+    await prisma.pdfDocument.delete({ where: { id: oldest.id } });
+    // Note: could also delete files from disk here
+  }
+
+  const fileId = uuidv4();
+  const uploadsDir = path.join(process.cwd(), "public", "uploads", user.id);
+  await mkdir(uploadsDir, { recursive: true });
+
+  const fileName = `${fileId}.pdf`;
+  const filePath = path.join(uploadsDir, fileName);
+  const buffer = Buffer.from(await file.arrayBuffer());
+  await writeFile(filePath, buffer);
+
+  const publicPath = `/uploads/${user.id}/${fileName}`;
+
+  // Detect page count from the uploaded PDF
+  let pageCount = 0;
+  try {
+    const pdfjsLib = await import("pdfjs-dist/legacy/build/pdf.mjs");
+    const loadingTask = pdfjsLib.getDocument({ data: new Uint8Array(buffer) });
+    const pdfDoc = await loadingTask.promise;
+    pageCount = pdfDoc.numPages;
+  } catch {
+    // fallback: if pdfjs fails, just store 0
+  }
+
+  const doc = await prisma.pdfDocument.create({
+    data: {
+      userId: user.id,
+      originalName: file.name,
+      filePath: publicPath,
+      fileSize: file.size,
+      pageCount,
+    },
+  });
+
+  return NextResponse.json({ document: doc }, { status: 201 });
+}