fix: reduce GetCascadeTrajectory log spam from debug to trace

src/backend.rs

@@ -261,10 +261,18 @@ impl Backend {
         let raw = resp.bytes().await
             .map_err(|e| format!("Read body error: {e}"))?;
         let resp_bytes = decompress(method, &raw, &encoding);
+        // High-frequency polling methods → trace; everything else → debug
+        if method.starts_with("GetCascadeTrajectory") {
+            tracing::trace!(
+                "{method} response ({status}, {} bytes, enc={encoding})",
+                resp_bytes.len(),
+            );
+        } else {
             tracing::debug!(
                 "{method} response ({status}, {} bytes, enc={encoding})",
                 resp_bytes.len(),
             );
+        }
         tracing::trace!(
             "{method} body: {}",
             String::from_utf8_lossy(&resp_bytes[..resp_bytes.len().min(200)])