fix: remove response_format incompatible with LM Studio API

Reviewed-on: #4

Dockerfile.backend

@@ -30,6 +30,7 @@ ENV NODE_ENV=production
 COPY --from=build /app/backend/dist ./dist
 COPY --from=build /app/backend/package.json ./package.json
 COPY --from=build /app/node_modules ./node_modules
+COPY --from=build /app/backend/node_modules/ ./node_modules/
 COPY backend/.env .env
 
 EXPOSE 3000

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 }>
-// eslint-disable-next-line @typescript-eslint/no-require-imports
-const pdfParse: (buf: Buffer) => Promise<{ text: string }> = require('pdf-parse');
+// 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
+    _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);
@@ -113,7 +119,6 @@ export async function convertPdfToStatement(
       ],
       temperature: 0,
       max_tokens: 32768,
-      response_format: { type: 'json_object' },
     });
 
     const content = completion.choices[0]?.message?.content?.trim();