Fix Pinecone API compatibility for v6.x

Update embedding service to use new Pinecone API syntax:
- Import ServerlessSpec from pinecone package
- Add spec parameter to create_index() call with AWS serverless configuration
- Resolves TypeError: missing required positional argument 'spec'
- Maintains existing functionality with updated API requirements

app/services/embedding.py

@@ -1,7 +1,7 @@
 import cohere
 from typing import List, Dict, Any, Optional
 import uuid
-from pinecone import Pinecone
+from pinecone import Pinecone, ServerlessSpec
 import weaviate
 from loguru import logger
 
@@ -31,7 +31,11 @@ class EmbeddingService:
                 pc.create_index(
                     name=settings.PINECONE_INDEX_NAME,
                     dimension=1024,  # Cohere embed-english-v3.0 dimension
-                    metric="cosine"
+                    metric="cosine",
+                    spec=ServerlessSpec(
+                        cloud='aws',
+                        region='us-east-1'
+                    )
                 )
             
             # Return the index