feat: Add charging routes and handler integration to API server

- Add chargingH field to serverDeps struct
- Add ChargingEngineClient initialization in buildDeps
- Add NewChargingHandler with chargingEngineClient dependency
- Add registerChargingRoutes function with /charging group
- Add POST /charging/credit/:ip/check endpoint
- Add GET /charging/credit/:ip/balance endpoint
- Add POST /charging/credit/:ip/add endpoint
- Add POST /charging/credit/:ip/deduct endpoint
- Call registerChargingRoutes in

apps/api-server/cmd/server_deps.go

@@ -26,6 +26,7 @@ type serverDeps struct {
 	configH      *handlers.ConfigHandler
 	chaosH       *handlers.ChaosHandler
 	billingH     *handlers.BillingHandler
+	chargingH    *handlers.ChargingHandler
 }
 
 // buildDeps constructs all downstream services and handlers.
@@ -46,6 +47,9 @@ func buildDeps(db *database.Database, cfg *config.Config) *serverDeps {
 	deploymentSvc := services.NewDeploymentService(db)
 	promSvc := monitoring.NewPrometheusService()
 
+	// Initialize charging engine client
+	chargingEngineClient := services.NewChargingEngineClient(&cfg.ChargingEngine)
+
 	k8sSvc, k8sErr := services.NewKubernetesService()
 	if k8sErr != nil {
 		log.Printf("Kubernetes integration disabled: %v", k8sErr)
@@ -63,6 +67,7 @@ func buildDeps(db *database.Database, cfg *config.Config) *serverDeps {
 		configH:      handlers.NewConfigHandler(configStoreSvc),
 		chaosH:       handlers.NewChaosHandler(chaosSvc),
 		billingH:     handlers.NewBillingHandler(invoiceSvc, db.DB),
+		chargingH:    handlers.NewChargingHandler(chargingEngineClient),
 	}
 }
 

apps/api-server/cmd/server_routes.go

@@ -51,6 +51,7 @@ func registerV1Routes(router *gin.Engine, d *serverDeps) {
 		registerBillingRoutes(apiProtected, d)
 		registerConfigRoutes(apiProtected, d)
 		registerChaosRoutes(apiProtected, d)
+		registerChargingRoutes(apiProtected, d)
 	}
 }
 
@@ -159,3 +160,11 @@ func registerChaosRoutes(api *gin.RouterGroup, d *serverDeps) {
 	applyRBAC(w, d.casbinSvc, "/v1/chaos", "POST", "admin")
 	w.POST("/experiments", d.chaosH.Run)
 }
+
+func registerChargingRoutes(api *gin.RouterGroup, d *serverDeps) {
+	charging := api.Group("/charging")
+	charging.POST("/credit/:ip/check", d.chargingH.CheckCredit)
+	charging.GET("/credit/:ip/balance", d.chargingH.GetBalance)
+	charging.POST("/credit/:ip/add", d.chargingH.AddCredit)
+	charging.POST("/credit/:ip/deduct", d.chargingH.DeductCredit)
+}