perf(docling): un seul document traité à la fois (docker-compose.json)

apps/docling/docker-compose.json

@@ -23,6 +23,10 @@
           "key": "UVICORN_WORKERS",
           "value": "1"
         },
+        {
+          "key": "DOCLING_SERVE_ENG_LOC_NUM_WORKERS",
+          "value": "1"
+        },
         {
           "key": "TZ",
           "value": "${TZ:-Europe/Paris}"