count pages per version

backend/src/routes/documents.rs

@@ -107,6 +107,7 @@ pub struct DocumentVersionResponse {
     pub size_bytes: i64,
     pub checksum: String,
     pub created_at: String,
+    pub metadata: Value,
     pub operations_summary: Value,
 }
 
@@ -1641,6 +1642,7 @@ async fn process_upload(
                 s3_key: s3_key.clone(),
                 size_bytes,
                 checksum: checksum_hex.clone(),
+                metadata: Value::Object(Default::default()),
                 operations_summary: Value::Object(Default::default()),
             };
 
@@ -1871,6 +1873,7 @@ fn to_version_response(version: DocumentVersion) -> DocumentVersionResponse {
         size_bytes: version.size_bytes,
         checksum: version.checksum,
         created_at: to_iso(version.created_at),
+        metadata: version.metadata,
         operations_summary: version.operations_summary,
     }
 }