perf: remove totally redundant and highly allocating .to_lowercase() calls from search endpoints

server/src/handlers_v2/workspaces.rs

@@ -146,7 +146,7 @@ impl McpTool for SearchSnippetsHandler {
 
     async fn execute(&self, args: Value, state: Arc<MemoryState>) -> Result<String, String> {
         let req: SearchSnippetsTool = serde_json::from_value(args).map_err(|e| e.to_string())?;
-        let query = req.query.to_lowercase();
+        let query = req.query;
         let data = state.snippets.read_with(|snippets| {
             let results: Vec<_> = snippets.iter().filter(|s| {
                 contains_ignore_ascii_case(&s.name, &query)