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/recall.go

@@ -58,7 +58,7 @@ func (t *RecallTool) Handle(ctx context.Context, req *mcp.CallToolRequest, in Re
 		projectID = &project.ID
 	}
 
-	semantic, err := t.store.SearchSimilarThoughts(ctx, embedding, t.search.DefaultThreshold, limit, projectID, nil)
+	semantic, err := t.store.SearchSimilarThoughts(ctx, embedding, t.provider.EmbeddingModel(), t.search.DefaultThreshold, limit, projectID, nil)
 	if err != nil {
 		return nil, RecallOutput{}, err
 	}