refactor: rename deploy/k8s to deploy/kubernetes; add SetEnvKeyReplacer for env var support in K8s

backend/cmd/main.go

@@ -7,6 +7,7 @@ import (
 	"net/http"
 	"os"
 	"os/signal"
+	"strings"
 	"syscall"
 	"time"
 
@@ -245,6 +246,7 @@ func loadConfig() *config.Config {
 	}
 
 	// 环境变量覆盖 // Logan.Li
+	viper.SetEnvKeyReplacer(strings.NewReplacer(".", "_"))
 	viper.AutomaticEnv()
 
 	// CLI flags 覆盖（最高优先级）// Logan.Li