chore: vendor sglang v0.5.10 snapshot

third_party/sglang/sgl-model-gateway/bindings/python/MANIFEST.in

@@ -0,0 +1,9 @@
+# Must include:
+include Cargo.toml              # Python bindings Cargo configuration
+include ../../Cargo.toml        # Main Rust project configuration
+include ../../build.rs          # Build script for protobuf generation
+include ../../LICENSE
+recursive-include src *.rs      # Python bindings wrapper
+recursive-include ../../src *.rs  # Main Rust source files
+recursive-include ../../src/proto *.proto  # Protobuf definitions
+recursive-include sglang_router *.py  # Python source files