fix: lazy-load pdf-parse to prevent startup crash if module is missing

backend/src/services/pdfToStatement.ts

@@ -63,9 +63,15 @@ export function isPdfConversionError(r: unknown): r is PdfConversionError {
   );
 }
 
-// pdf-parse v1 default export: (buffer, options?) => Promise<{ text, numpages, info }>
+// Lazy-loaded so the app starts even if pdf-parse is missing from node_modules.
+let _pdfParse: ((buf: Buffer) => Promise<{ text: string }>) | undefined;
+function getPdfParse() {
+  if (!_pdfParse) {
     // eslint-disable-next-line @typescript-eslint/no-require-imports
-const pdfParse: (buf: Buffer) => Promise<{ text: string }> = require('pdf-parse');
+    _pdfParse = require('pdf-parse') as (buf: Buffer) => Promise<{ text: string }>;
+  }
+  return _pdfParse;
+}
 
 export async function convertPdfToStatement(
   buffer: Buffer,
@@ -80,7 +86,7 @@ export async function convertPdfToStatement(
 
   let text: string;
   try {
-    const result = await pdfParse(buffer);
+    const result = await getPdfParse()(buffer);
     text = result.text || '';
   } catch (err) {
     console.error('PDF extraction error:', err);