Add config download endpoint

backend/api.py

@@ -103,6 +103,14 @@ async def send_config(request: Request):
 
     pdf_path = UPLOADS_DIR / f"{pdf_id}.pdf"
     return {"ok": True, "stored": str(out_path), "pdf_exists": pdf_path.exists()}
+
+@app.get("/api/config/{pdf_id}/{template_id}")
+def get_config(pdf_id: str, template_id: str):
+    path = CONFIGS_DIR / f"{pdf_id}__{template_id}.json"
+    if not path.exists():
+        raise HTTPException(status_code=404, detail="Config not found")
+    return FileResponse(path, media_type="application/json", filename=path.name)
+
 @app.post("/api/notify-unknown")
 async def notify_unknown(payload: Dict[str, Any]):
     """