fix(rust): migrate python-config GIL call and cover it in CI

.github/workflows/test-rust.yml

@@ -73,6 +73,9 @@ jobs:
       - name: Run Clippy
         run: cargo clippy --workspace --all-targets --locked -- -D warnings
 
+      - name: Run Clippy (python-config feature)
+        run: cargo clippy -p litellm-ai-gateway --all-targets --features python-config --locked -- -D warnings
+
       - name: Run Rust tests
         run: cargo test --workspace --locked
 

litellm-rust/crates/ai-gateway/src/python/config.rs

@@ -17,7 +17,7 @@ use crate::gil;
 /// Load the router's `model_list` from `config_path` via the Python reader.
 pub fn load_router_from_config(config_path: &str) -> CoreResult<Router> {
     gil::record_acquisition();
-    Python::with_gil(|py| {
+    Python::attach(|py| {
         let model_list = py
             .import("litellm.proxy.read_model_list")
             .and_then(|module| module.getattr("read_model_list"))