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/openflare/openflare.go

@@ -0,0 +1,16 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+// Package openflare registers OpenFlare HTTP routes.
+// Management console APIs are mounted via RegisterV1Routes under /api/v1/custom/openflare.
+// Agent/Relay/Flared protocol routes are mounted via RegisterRoutes under /api.
+package openflare
+
+import "github.com/gin-gonic/gin"
+
+// RegisterRoutes mounts Agent/Relay/Flared protocol routes under the /api group.
+func RegisterRoutes(apiGroup *gin.RouterGroup) {
+	registerAgentRoutes(apiGroup)
+	registerRelayRoutes(apiGroup)
+	registerFlaredRoutes(apiGroup)
+}