refactor(openflare): migrate console APIs to v1 and centralize routing

Move OpenFlare management endpoints to /api/v1/custom/openflare with
Wavelet response envelopes and Abort* error handling. Keep agent, relay,
and flared protocol routes on /api/* with the legacy compat format.

- Add apiutil helpers and Swagger annotations for console handlers
- Register all OpenFlare routes in internal/router/openflare (not apps)
- Switch frontend services to OpenFlareBaseService and v1 paths
- Remove dead auth/compat code and legacy-base.service.ts
- Update integration tests and changelog

Wavelet/internal/router/router.go

@@ -15,10 +15,10 @@ import (
 	"syscall"
 	"time"
 
-	oflegacy "github.com/Rain-kl/Wavelet/internal/apps/openflare/legacy"
 	"github.com/Rain-kl/Wavelet/internal/apps/risk_control"
 	router_root "github.com/Rain-kl/Wavelet/internal/router/root"
 	v1 "github.com/Rain-kl/Wavelet/internal/router/v1"
+	ofrouter "github.com/Rain-kl/Wavelet/internal/router/v1/openflare"
 
 	"github.com/Rain-kl/Wavelet/internal/apps/oauth"
 	"github.com/Rain-kl/Wavelet/internal/config"
@@ -116,8 +116,8 @@ func registerRoutes(r *gin.Engine) {
 
 	apiGroup := r.Group(config.Config.App.APIPrefix)
 	{
-		// OpenFlare legacy /api/* routes (old frontend compatibility)
-		oflegacy.RegisterRoutes(apiGroup)
+		// OpenFlare Agent/Relay/Flared protocol routes under /api/*
+		ofrouter.RegisterRoutes(apiGroup)
 
 		// API V1
 		apiV1Router := apiGroup.Group("/v1")