fix(embedding): resolve large_enum_variant clippy error

server/src/embedding.rs

@@ -193,14 +193,14 @@ fn fallback_embed(text: &str) -> Vec<f32> {
 }
 
 enum EmbeddingModel {
-    Candle(CandleEmbeddingModel),
+    Candle(Box<CandleEmbeddingModel>),
     Fallback,
 }
 
 impl EmbeddingModel {
     fn new() -> Self {
         match CandleEmbeddingModel::new() {
-            Ok(model) => EmbeddingModel::Candle(model),
+            Ok(model) => EmbeddingModel::Candle(Box::new(model)),
             Err(e) => {
                 tracing::warn!(
                     "Failed to initialize Candle BERT model ({e}); falling back to deterministic offline embeddings."