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/prisma/schema.prisma

@@ -13,10 +13,29 @@ datasource db {
   provider = "postgresql"
 }
 
-model user{
-  id        String   @id @default(uuid())
-  email     String   @unique
+model user {
+  id        String        @id @default(uuid())
+  email     String        @unique
   name      String?
-  createdAt DateTime @default(now())
-  updatedAt DateTime @updatedAt
+  createdAt DateTime      @default(now())
+  updatedAt DateTime      @updatedAt
+  documents pdfDocument[]
+}
+
+model pdfDocument {
+  id              String   @id @default(uuid())
+  userId          String
+  user            user     @relation(fields: [userId], references: [id], onDelete: Cascade)
+  originalName    String
+  filePath        String
+  pixelResultDir  String?
+  ocrResultDir    String?
+  ocrRan          Boolean  @default(false)
+  fileSize        Int
+  pageCount       Int      @default(1)
+  pixelPageCount  Int      @default(0)
+  ocrPageCount    Int      @default(0)
+  createdAt       DateTime @default(now())
+
+  @@index([userId])
 }