refactor(api): unify routes under /api/v1/d, agent, relay, tunnel

Remove the /openflare prefix from management APIs (/api/v1/d/*) and move
Agent, Relay, and Tunnel protocol endpoints under /api/v1. Update Wavelet
frontend services and node client binaries to match.

Wavelet/internal/apps/openflare/integration/helpers_test.go

@@ -83,8 +83,6 @@ func unmarshalEnvelopeSlice(t *testing.T, data any) []any {
 
 func mountOpenFlareTestRoutes(engine *gin.Engine) {
 	api := engine.Group("/api")
-	ofrouter.RegisterRoutes(api)
-
 	apiV1 := api.Group("/v1")
 	v1.RegisterV1Routes(apiV1, api)
 }