Cleanup unused message embedding code

Fixup some warnings

src/database/mod.rs

@@ -11,7 +11,6 @@ use crate::otel::trace_db_call;
 
 pub mod calendar_dao;
 pub mod daily_summary_dao;
-pub mod embeddings_dao;
 pub mod insights_dao;
 pub mod location_dao;
 pub mod models;
@@ -20,7 +19,6 @@ pub mod search_dao;
 
 pub use calendar_dao::{CalendarEventDao, SqliteCalendarEventDao};
 pub use daily_summary_dao::{DailySummaryDao, InsertDailySummary, SqliteDailySummaryDao};
-pub use embeddings_dao::{EmbeddingDao, InsertMessageEmbedding};
 pub use insights_dao::{InsightDao, SqliteInsightDao};
 pub use location_dao::{LocationHistoryDao, SqliteLocationHistoryDao};
 pub use search_dao::{SearchHistoryDao, SqliteSearchHistoryDao};