feat: implement region-based QR code scanning for inbox documents

paperless-frontend/src/api/inbox.ts

@@ -93,6 +93,14 @@ export const inboxApi = {
     api
       .post(`/api/inbox/${encodeURIComponent(id)}/source`, { source })
       .then((r) => r.data),
+
+  scanRegion: (id: string, page: number, region: { x: number; y: number; w: number; h: number }) =>
+    api
+      .post<{ found: string[] }>(
+        `/api/inbox/${encodeURIComponent(id)}/pages/${page}/scan-region`,
+        region,
+      )
+      .then((r) => r.data),
 };
 
 export interface PostprocessActionResult {