Refactor: support config strong test (#9198)

### What problem does this PR solve?


https://github.com/infiniflow/ragflow/issues/9189#issuecomment-3148920950

### Type of change
- [x] Refactoring

Co-authored-by: Kevin Hu <kevinhu.sh@gmail.com>

api/settings.py

 # sandbox-executor-manager
 SANDBOX_ENABLED = 0
 SANDBOX_HOST = None
+STRONG_TEST_COUNT = int(os.environ.get("STRONG_TEST_COUNT", "32"))
 
 BUILTIN_EMBEDDING_MODELS = ["BAAI/bge-large-zh-v1.5@BAAI", "maidalun1020/bce-embedding-base_v1@Youdao"]
 

api/utils/api_utils.py

 
 
 async def is_strong_enough(chat_model, embedding_model):
+    count = settings.STRONG_TEST_COUNT
+    if not chat_model or not embedding_model:
+        return
+    if isinstance(count, int) and count <= 0:
+        return
+
     @timeout(60, 2)
     async def _is_strong_enough():
         nonlocal chat_model, embedding_model
 
     # Pressure test for GraphRAG task
     async with trio.open_nursery() as nursery:
-        for _ in range(32):
+        for _ in range(count):
             nursery.start_soon(_is_strong_enough)