[Feature] Add Golang-based Router for Request Scheduling and Load Balancing (#5882)

* [Feature] add golang router

* [Feature] add golang router

* [Feature] add golang router

* [Feature] add golang router

* [Feature] add golang router

* [Feature] Add Golang-based Router for Request Scheduling and Load Balancing

* [Feature] Add Golang-based Router for Request Scheduling and Load Balancing

* [Feature] Add Golang-based Router for Request Scheduling and Load Balancing

* [Feature] Add Golang-based Router for Request Scheduling and Load Balancing

---------

Co-authored-by: mouxin <mouxin@baidu.com>

fastdeploy/golang_router/examples/run_with_config/run.sh

@@ -0,0 +1,23 @@
+#!/bin/bash
+
+PID=$(ps -ef | grep "fd-router" | grep -v grep | awk '{print $2}')
+if [ -n "$PID" ]; then
+    echo "Killing existing fd-router process (PID: $PID)"
+    # Try graceful shutdown first
+    kill -15 $PID
+    TIMEOUT=10
+    while kill -0 $PID 2>/dev/null && [ $TIMEOUT -gt 0 ]; do
+        echo "Waiting for fd-router (PID: $PID) to exit gracefully... ($TIMEOUT seconds remaining)"
+        sleep 1
+        TIMEOUT=$((TIMEOUT - 1))
+    done
+    # Force kill if still running after timeout
+    if kill -0 $PID 2>/dev/null; then
+        echo "fd-router (PID: $PID) did not exit gracefully; sending SIGKILL..."
+        kill -9 $PID
+    fi
+fi
+
+echo "Starting new fd-router process..."
+nohup ./fd-router --config_path ./config/config.yaml --splitwise > fd-router.log 2>&1 &
+echo "fd-router started with PID: $!"