[misc] Add labeler for automatic labeling (#12710)

.github/labeler.yml

+# Configuration for the GitHub Labeler action
+# Automatically adds labels to PRs based on the files changed
+
+# Router specific (Rust code in sgl-router)
+router:
+  - changed-files:
+    - any-glob-to-any-file: 'sgl-router/**/*'
+
+# Router benchmarks
+router-benchmark:
+  - changed-files:
+    - any-glob-to-any-file:
+      - 'sgl-router/benches/**/*'
+      - 'sgl-router/scripts/run_benchmarks.py'
+      - 'sgl-router/**/*bench*.rs'
+
+# Kernel specific
+sgl-kernel:
+  - changed-files:
+    - any-glob-to-any-file: 'sgl-kernel/**/*'
+
+# Documentation
+documentation:
+  - changed-files:
+    - any-glob-to-any-file:
+      - '**/*.md'
+      - 'docs/**/*'
+      - 'README*'
+
+# Dependencies
+dependencies:
+  - changed-files:
+    - any-glob-to-any-file:
+      - '**/requirements*.txt'
+      - '**/Cargo.toml'
+      - '**/Cargo.lock'
+      - '**/pyproject.toml'
+      - '**/setup.py'
+      - '**/poetry.lock'
+      - '**/package.json'
+      - '**/package-lock.json'
+
+# Multi-modal
+Multi-modal:
+  - changed-files:
+    - any-glob-to-any-file:
+      - '**/vision/**/*'
+      - '**/multimodal/**/*'
+      - '**/vlm/**/*'
+
+# LoRA
+lora:
+  - changed-files:
+    - any-glob-to-any-file:
+      - '**/lora/**/*'
+      - '**/*lora*'
+
+# Quantization
+quant:
+  - changed-files:
+    - any-glob-to-any-file:
+      - '**/quant/**/*'
+      - '**/*quant*'
+      - '**/awq/**/*'
+      - '**/gptq/**/*'
+
+# Performance related
+performance:
+  - changed-files:
+    - any-glob-to-any-file:
+      - '**/benchmark/**/*'
+      - '**/benches/**/*'
+      - '**/perf/**/*'
+      - '**/*benchmark*'
+
+# Speculative decoding
+speculative-decoding:
+  - changed-files:
+    - any-glob-to-any-file:
+      - '**/speculative/**/*'
+      - '**/*speculative*'
+
+# AMD specific
+amd:
+  - changed-files:
+    - any-glob-to-any-file:
+      - '**/*amd*'
+      - '**/*rocm*'
+
+# DeepSeek specific
+deepseek:
+  - changed-files:
+    - any-glob-to-any-file:
+      - '**/*deepseek*'
+
+# HiCache
+hicache:
+  - changed-files:
+    - any-glob-to-any-file:
+      - '**/hicache/**/*'
+      - '**/*hicache*'

.github/workflows/labeler.yml

+name: Auto Label PRs
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened]
+
+permissions:
+  contents: read
+  pull-requests: write
+
+jobs:
+  label:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/labeler@v5
+        with:
+          repo-token: "${{ secrets.GITHUB_TOKEN }}"
+          configuration-path: .github/labeler.yml
+          sync-labels: true

.github/workflows/lint.yml

@@ -32,3 +32,19 @@ jobs:
           extensions: h,c,cpp,hpp,cu,cuh,cc
           clangFormatVersion: 18
           style: file
+
+      - name: Check proto files are in sync
+        run: |
+          if ! diff -q python/sglang/srt/grpc/sglang_scheduler.proto sgl-router/src/proto/sglang_scheduler.proto; then
+            echo "❌ ERROR: Proto files are out of sync!"
+            echo ""
+            echo "The following files must be kept identical:"
+            echo "  - python/sglang/srt/grpc/sglang_scheduler.proto"
+            echo "  - sgl-router/src/proto/sglang_scheduler.proto"
+            echo ""
+            echo "Please ensure both files have the same content."
+            echo ""
+            echo "Differences:"
+            diff python/sglang/srt/grpc/sglang_scheduler.proto sgl-router/src/proto/sglang_scheduler.proto || true
+            exit 1
+          fi