fix: use pdf-parse v2 API (PDFParse class, not default export)

web/app/api/parse-upload/route.ts

@@ -33,14 +33,16 @@ export async function POST(req: NextRequest) {
     if (name.endsWith(".txt") || name.endsWith(".md")) {
       text = new TextDecoder().decode(buffer);
     } else if (name.endsWith(".pdf")) {
-      // FIX v4.3: pdf-parse API compatible with both v1 and v2
-      // Try the standard pdf-parse import (works with v1.x which is more common)
+      // pdf-parse v2 API: named export PDFParse class + worker import
       try {
-        const pdfParse = (await import("pdf-parse")).default;
-        const result = await pdfParse(buffer);
+        await import("pdf-parse/worker");
+        const { PDFParse } = await import("pdf-parse");
+        const parser = new PDFParse({ data: buffer });
+        const result = await parser.getText();
         text = result.text;
-      } catch {
-        // If pdf-parse fails, try sending to Gradio Space for OCR
+        await parser.destroy();
+      } catch (pdfErr: any) {
+        console.error("PDF parse error:", pdfErr);
         return NextResponse.json({
           error: "PDF parsing failed. Please copy-paste the text directly, or use the Gradio Space which has OCR support."
         }, { status: 400 });