chore: vendor sglang v0.5.10 snapshot

third_party/sglang/sgl-model-gateway/examples/wasm/wasm-guest-logging/README.md

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+# WASM Logging Example for sgl-model-gateway
+
+This example demonstrates logging and tracing middleware for sgl-model-gateway using the WebAssembly Component Model.
+
+## Overview
+
+This middleware provides:
+
+- **Request Tracking** - Adds tracking headers (`x-request-id`, `x-wasm-processed`, `x-processed-at`, `x-api-route`)
+- **Status Code Conversion** - Converts `500` errors to `503`
+
+## Quick Start
+
+### Build and Deploy
+
+```bash
+# Build
+cd examples/wasm-guest-logging
+./build.sh
+
+# Deploy (replace file_path with actual path)
+curl -X POST http://localhost:3000/wasm \
+  -H "Content-Type: application/json" \
+  -d '{
+    "modules": [{
+      "name": "logging-middleware",
+      "file_path": "/absolute/path/to/wasm_guest_logging.component.wasm",
+      "module_type": "Middleware",
+      "attach_points": [{"Middleware": "OnRequest"}, {"Middleware": "OnResponse"}]
+    }]
+  }'
+```
+
+### Customization
+
+Modify `on_request` or `on_response` functions in `src/lib.rs` to add custom tracking headers or status code conversions.
+
+## Testing
+
+```bash
+# Check tracking headers
+curl -v http://localhost:3000/v1/models 2>&1 | \
+  grep -E "(x-request-id|x-wasm-processed|x-processed-at)"
+
+# Test status code conversion (requires endpoint returning 500)
+curl -v http://localhost:3000/some-endpoint 2>&1 | grep -E "(< HTTP|500|503)"
+```
+
+## Troubleshooting
+
+- Verify module attached to both `OnRequest` and `OnResponse` phases
+- Check router logs for execution errors
+- Ensure module built successfully