feat: implement OCR parsing status tracking and biomarker count display

backend/src/handlers/sources.rs

@@ -24,6 +24,8 @@ pub struct SourceResponse {
     pub file_path: String,
     pub file_type: String,
     pub file_size: i64,
+    pub status: String,
+    pub biomarker_count: Option<i32>,
     pub ocr_data: Option<String>,
     pub description: Option<String>,
     pub uploaded_at: String,
@@ -55,6 +57,8 @@ pub async fn list_sources(
             file_path: s.file_path,
             file_type: s.file_type,
             file_size: s.file_size,
+            status: s.status,
+            biomarker_count: s.biomarker_count,
             ocr_data: s.ocr_data,
             description: s.description,
             uploaded_at: s.uploaded_at.to_string(),
@@ -82,6 +86,8 @@ pub async fn get_source(
         file_path: s.file_path,
         file_type: s.file_type,
         file_size: s.file_size,
+        status: s.status,
+        biomarker_count: s.biomarker_count,
         ocr_data: s.ocr_data,
         description: s.description,
         uploaded_at: s.uploaded_at.to_string(),
@@ -166,6 +172,8 @@ pub async fn upload_source(
         file_path: Set(file_path.to_string_lossy().to_string()),
         file_type: Set(content_type.clone()),
         file_size: Set(file_size),
+        status: Set("pending".to_string()),
+        biomarker_count: Set(None),
         ocr_data: Set(None),
         description: Set(description.clone()),
         uploaded_at: Set(now),
@@ -187,6 +195,8 @@ pub async fn upload_source(
         file_path: inserted.file_path,
         file_type: inserted.file_type,
         file_size: inserted.file_size,
+        status: inserted.status,
+        biomarker_count: inserted.biomarker_count,
         ocr_data: inserted.ocr_data,
         description: inserted.description,
         uploaded_at: inserted.uploaded_at.to_string(),
@@ -256,6 +266,8 @@ pub async fn update_ocr(
         file_path: updated.file_path,
         file_type: updated.file_type,
         file_size: updated.file_size,
+        status: updated.status,
+        biomarker_count: updated.biomarker_count,
         ocr_data: updated.ocr_data,
         description: updated.description,
         uploaded_at: updated.uploaded_at.to_string(),