Use weaviate as default vector store

Author: ajhai

llmstack/server/settings.py

@@ -131,9 +131,9 @@
 VECTOR_DATABASES = {
     "default": {
         "ENGINE": "{}".format(
-            os.getenv("VECTOR_DATABASE_ENGINE", "chroma"),
+            os.getenv("VECTOR_DATABASE_ENGINE", "weaviate"),
         ),
-        "NAME": os.getenv("VECTOR_DATABASE_NAME", "./llmstack.chromadb"),
+        "NAME": os.getenv("VECTOR_DATABASE_NAME", "llmstack"),
         "HOST": os.getenv("VECTOR_DATABASE_HOST", "http://weaviate:8080"),
         "USER": os.getenv("VECTOR_DATABASE_USERNAME", None),
         "PASSWORD": os.getenv("VECTOR_DATABASE_PASSWORD", None),