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/v1/custom.go

@@ -6,6 +6,7 @@ package v1
 
 import (
 	"github.com/Rain-kl/Wavelet/internal/apps/custom"
+	ofrouter "github.com/Rain-kl/Wavelet/internal/router/v1/openflare"
 	"github.com/gin-gonic/gin"
 )
 
@@ -14,5 +15,6 @@ func RegisterCustomRoutes(apiV1Router *gin.RouterGroup) {
 	customRouter := apiV1Router.Group("/custom")
 	{
 		customRouter.GET("/hello", custom.Hello)
+		ofrouter.RegisterV1Routes(customRouter)
 	}
 }