ci(wheel): build with mm-rdma so the vLLM RDMA e2e exercises the real NIXL lane

The e2e wheel was built --features vendored-openssl only, so smg-mm-rdma
compiled its no-op stub and every multimodal export fell back to inline —
smg_mm_tensor_bytes_total{path="remote"} stayed 0 and test_single_image_uses_rdma
failed. Forward an mm-rdma feature from smg-python to smg/mm-rdma and enable it in
the wheel build so the gateway ships the real NIXL exporter.

Signed-off-by: Simo Lin <linsimo.mark@gmail.com>

Author: slin1237

bindings/python/Cargo.toml

@@ -36,6 +36,7 @@ workspace = true
 default = ["pyo3/extension-module"]
 opencv-video = ["smg/opencv-video"]
 vendored-openssl = ["smg/vendored-openssl"]
+mm-rdma = ["smg/mm-rdma"]
 
 [profile.ci]
 inherits = "release"

scripts/ci_build_wheel.sh

@@ -18,6 +18,13 @@ fi
 # Install maturin and zig for manylinux cross-compilation
 python3 -m pip install --upgrade pip maturin ziglang
 
+# The mm-rdma feature pulls nixl-sys, which runs bindgen at build time and needs
+# libclang. Install it (Debian/Ubuntu runners) so binding generation can find it.
+if command -v apt-get >/dev/null 2>&1; then
+    sudo apt-get update
+    sudo apt-get install -y --no-install-recommends clang libclang-dev
+fi
+
 # Start Go FFI build in background
 echo "Starting Go FFI build in background..."
 (cd bindings/golang && make build && echo "Go FFI: OK" && ls -la target/release/libsmg_go.*) &
@@ -26,7 +33,7 @@ GO_PID=$!
 # Build Python wheel in foreground
 echo "Building Python wheel..."
 cd bindings/python
-maturin build --profile ci --features vendored-openssl --manylinux 2_28 --zig --out dist
+maturin build --profile ci --features vendored-openssl,mm-rdma --manylinux 2_28 --zig --out dist
 echo "Python wheel: OK"
 ls -lh dist/