feat: implement hybrid fetch_url tool and isolate crashes

server/src/bin/test_candle_crash.rs

@@ -0,0 +1,11 @@
+use mcp_memory_server::embedding::generate_embeddings_async;
+
+#[tokio::main]
+async fn main() {
+    println!("Testing candle embeddings...");
+    let res = generate_embeddings_async(vec!["hello world".to_string()]).await;
+    match res {
+        Ok(v) => println!("Success: vector length {}", v.len()),
+        Err(e) => println!("Error: {}", e),
+    }
+}