refactor(repo): consolidate openflare-server to root and move subprojects to internal/apps

- Merge all files inside openflare-server to the repository root directory.
- Relocate agent, relay, and flared subprojects from internal/ to internal/apps/.
- Combine docker-compose files and update build context paths to root.
- Update GitHub workflows and Dockerfiles to refer to new directories and package names.
- Rewrite Go package imports across all files.
- Resolve database renew test race condition and clean up docs.

internal/task/handlers/register.go

@@ -0,0 +1,52 @@
+// Copyright 2025 linux.do
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+// Package handlers 注册异步任务处理器
+package handlers
+
+import (
+	"github.com/Rain-kl/Wavelet/internal/apps/admin/push"
+	"github.com/Rain-kl/Wavelet/internal/apps/openflare"
+	"github.com/Rain-kl/Wavelet/internal/apps/upload"
+	"github.com/Rain-kl/Wavelet/internal/apps/user"
+	"github.com/Rain-kl/Wavelet/internal/task"
+)
+
+// Register registers all built-in task handlers and their metadata.
+func Register() {
+	task.RegisterHandler(upload.StorageMigrationTask, &upload.MigrationHandler{})
+	task.RegisterTaskMeta(upload.StorageMigrationMeta)
+
+	// system cleanup
+	task.RegisterHandler(upload.SystemCleanupTask, &upload.SystemCleanupHandler{})
+	task.RegisterTaskMeta(upload.SystemCleanupMeta)
+
+	// upload
+	task.RegisterHandler(upload.WarmImageCacheTask, &upload.WarmImageCacheHandler{})
+	task.RegisterTaskMeta(upload.WarmImageCacheMeta)
+
+	task.RegisterHandler(upload.RebuildUploadStatsTask, &upload.RebuildUploadStatsHandler{})
+	task.RegisterTaskMeta(upload.RebuildUploadStatsMeta)
+
+	// user
+	task.RegisterHandler(user.SendEmailTask, &user.SendEmailHandler{})
+	task.RegisterTaskMeta(user.SendEmailMeta)
+
+	// push
+	task.RegisterHandler(push.SendNotificationTask, &push.PushHandler{})
+	task.RegisterTaskMeta(push.SendNotificationMeta)
+
+	// openflare
+	task.RegisterHandler(openflare.SSLRenewTask, &openflare.SSLRenewHandler{})
+	task.RegisterTaskMeta(openflare.SSLRenewMeta)
+
+	task.RegisterHandler(openflare.DatabaseAutoCleanupTask, &openflare.DatabaseAutoCleanupHandler{})
+	task.RegisterTaskMeta(openflare.DatabaseAutoCleanupMeta)
+
+	task.RegisterHandler(openflare.WAFIPGroupSyncTask, &openflare.WAFIPGroupSyncHandler{})
+	task.RegisterTaskMeta(openflare.WAFIPGroupSyncMeta)
+
+	task.RegisterHandler(openflare.UptimeKumaSyncTask, &openflare.UptimeKumaSyncHandler{})
+	task.RegisterTaskMeta(openflare.UptimeKumaSyncMeta)
+}