#966 fix - litellm_sync import + IndentationError

## Root cause: ImportError sync_health_check not defined. ## Also IndentationError on L467/L590 in nested sync blocks. ## Container stable, public URL 200 OK.

backend/python/app/core/litellm_sync.py

@@ -0,0 +1,37 @@
+import logging, os, httpx
+logger = logging.getLogger(__name__)
+LITM = os.getenv("LITELLM_HOST", "qihu-aiflow-litellm")
+LITP = os.getenv("LITELLM_PORT", "4000")
+LITK = os.getenv("LITELLM_MASTER_KEY", "sk-litellm-master-key-aiflow-2026")
+BASE = f"http://{LITM}:{LITP}"
+_client = None
+
+def _gc():
+    global _client
+    if _client is None:
+        _client = httpx.Client(base_url=BASE, headers={"Authorization": f"Bearer {LITK}", "Content-Type": "application/json"}, timeout=15)
+    return _client
+
+def _ss(op, body):
+    try:
+        r = _gc().post(op, json=body)
+        if r.status_code in (200,201):
+            logger.info(f"[litellm-sync] {op} OK")
+            return True
+        logger.warning(f"[litellm-sync] {op} FAIL {r.status_code}")
+        return False
+    except Exception as e:
+        logger.error(f"[litellm-sync] {op} ERR {e}")
+        return False
+
+def sync_create_model(model_name, litellm_model, api_base, api_key):
+    return _ss("/model/new", {"model_name":model_name, "litellm_params":{"model":litellm_model, "api_base":api_base, "api_key":api_key}})
+
+def sync_update_model(old_name, new_name, litellm_model, api_base, api_key):
+    if old_name != new_name:
+        _ss("/model/delete", {"id":old_name})
+        return sync_create_model(new_name, litellm_model, api_base, api_key)
+    return _ss("/model/update", {"model_name":new_name, "litellm_params":{"model":litellm_model, "api_base":api_base, "api_key":api_key}})
+
+def sync_delete_model(model_name):
+    return _ss("/model/delete", {"id":model_name})