[router] remove old/oudated/useless comments across code base (#10968)

sgl-router/tests/common/mod.rs

@@ -71,7 +71,6 @@ pub fn ensure_tokenizer_cached() -> PathBuf {
 
         let content = response.bytes().expect("Failed to read tokenizer content");
 
-        // Verify we got actual JSON content
         if content.len() < 100 {
             panic!("Downloaded content too small: {} bytes", content.len());
         }