refactor(repo): replace legacy openflare-server with Wavelet rename

Delete the old monolithic openflare-server implementation and rename
Wavelet/ to openflare-server/ to complete the migration consolidation.
Update CI workflows, agent Dockerfiles, and deployment docs for the new
layout (frontend/, docker/Dockerfile).

openflare-server/internal/apps/openflare/tasks/doc.go

@@ -0,0 +1,9 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+// Package tasks hosts shared OpenFlare background job business logic.
+//
+// Scheduled execution is handled by the Wavelet Asynq task framework; handlers
+// live in internal/apps/openflare/async_tasks.go and are registered via
+// bootstrap.RegisterTasks().
+package tasks