fix(embedding): disable dimensions parameter by default

reme/config/cli.yaml

@@ -21,6 +21,7 @@ embedding_models:
     model_name: text-embedding-v4
     dimensions: 1024
     enable_cache: true
+    use_dimensions: false
 
 file_stores:
   default:

reme/core/embedding/base_embedding_model.py

@@ -30,7 +30,7 @@ class BaseEmbeddingModel(ABC):
         base_url: str | None = None,
         model_name: str = "",
         dimensions: int | None = 1024,
-        use_dimensions: bool = True,
+        use_dimensions: bool = False,
         max_batch_size: int = 10,
         max_retries: int = 3,
         raise_exception: bool = True,