[router] enable sccache in ci and local build (#10099)

sgl-router/Makefile

@@ -1,6 +1,15 @@
 # SGLang Router Makefile
 # Provides convenient shortcuts for common development tasks
 
+# Check if sccache is available and set RUSTC_WRAPPER accordingly
+SCCACHE := $(shell which sccache 2>/dev/null)
+ifdef SCCACHE
+    export RUSTC_WRAPPER := $(SCCACHE)
+    $(info Using sccache for compilation caching)
+else
+    $(info sccache not found. Install it for faster builds: cargo install sccache)
+endif
+
 .PHONY: help bench bench-quick bench-baseline bench-compare test build clean
 
 help: ## Show this help message
@@ -90,3 +99,33 @@ perf-monitor: ## Run continuous performance monitoring
 	else \
 		echo "Warning: 'watch' command not found. Install it or run 'make bench-quick' manually."; \
 	fi
+
+# sccache management targets
+setup-sccache: ## Install and configure sccache
+	@echo "Setting up sccache..."
+	@./scripts/setup-sccache.sh
+
+sccache-stats: ## Show sccache statistics
+	@if [ -n "$(SCCACHE)" ]; then \
+		echo "sccache statistics:"; \
+		sccache -s; \
+	else \
+		echo "sccache not installed. Run 'make setup-sccache' to install it."; \
+	fi
+
+sccache-clean: ## Clear sccache cache
+	@if [ -n "$(SCCACHE)" ]; then \
+		echo "Clearing sccache cache..."; \
+		sccache -C; \
+		echo "sccache cache cleared"; \
+	else \
+		echo "sccache not installed"; \
+	fi
+
+sccache-stop: ## Stop the sccache server
+	@if [ -n "$(SCCACHE)" ]; then \
+		echo "Stopping sccache server..."; \
+		sccache --stop-server || true; \
+	else \
+		echo "sccache not installed"; \
+	fi