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/apps/upload/storage/storage_ops.go

@@ -0,0 +1,31 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+package storage
+
+import (
+	"context"
+
+	"github.com/Rain-kl/Wavelet/internal/model"
+	"github.com/Rain-kl/Wavelet/internal/storage"
+	"github.com/Rain-kl/Wavelet/pkg/logger"
+)
+
+// ReadOnly checks if the storage system is in read-only maintenance mode.
+func ReadOnly(ctx context.Context) bool {
+	state := LoadMigrationAccessState(ctx)
+	if state.LoadErr != nil {
+		logger.ErrorF(ctx, "读取存储维护状态失败: %v", state.LoadErr)
+		return true
+	}
+	return state.ReadOnly
+}
+
+// OpenStoredObject opens a stored upload object from the active storage backend.
+func OpenStoredObject(ctx context.Context, upload *model.Upload) (*storage.Object, error) {
+	_, backend, err := storage.Active(ctx)
+	if err != nil {
+		return nil, err
+	}
+	return backend.Get(ctx, upload.FilePath)
+}