feat(embeddings): add embedding model support and related changes

* Introduced EmbeddingModel method in Client and Provider interfaces
* Updated InsertThought and SearchThoughts methods to handle embedding models
* Created embeddings table and updated match_thoughts function for model filtering
* Removed embedding column from thoughts table
* Adjusted permissions for new embeddings table

internal/tools/capture.go

@@ -83,7 +83,7 @@ func (t *CaptureTool) Handle(ctx context.Context, req *mcp.CallToolRequest, in C
 		thought.ProjectID = &project.ID
 	}
 
-	created, err := t.store.InsertThought(ctx, thought)
+	created, err := t.store.InsertThought(ctx, thought, t.provider.EmbeddingModel())
 	if err != nil {
 		return nil, CaptureOutput{}, err
 	}