Bump compliance upload limit to 100MB

NTS_AVVOC vertical xlsx is 72MB — 50MB was still too low.

backend/server.js

@@ -196,11 +196,11 @@ const upload = multer({
     limits: { fileSize: 10 * 1024 * 1024 } // 10MB limit
 });
 
-// Separate multer instance for compliance xlsx uploads — these can be 30MB+ for large verticals
+// Separate multer instance for compliance xlsx uploads — these can be 75MB+ for large verticals
 const complianceUpload = multer({
     storage: storage,
     fileFilter: fileFilter,
-    limits: { fileSize: 50 * 1024 * 1024 } // 50MB limit for compliance spreadsheets
+    limits: { fileSize: 100 * 1024 * 1024 } // 100MB limit for compliance spreadsheets
 });
 
 // Knowledge base routes (editor/admin for upload/delete, all authenticated for view)