refactor(layout): consolidate backend codebase into backend/ package and clean root directory

- Moved cmd/, core/, plugins/, pkg/, downstream/, and main.go into backend/ directory
- Batch updated all Go source files to import github.com/Rain-kl/Wavelet/backend/...
- Updated Makefile, scripts/swagger.sh, architecture guards, and platform skills
- Passed all quality gates (100% tests, 0 lint issues, clean build)

backend/pkg/buildinfo/buildinfo.go

@@ -0,0 +1,12 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+// Package buildinfo exposes metadata injected by the release workflow.
+package buildinfo
+
+var (
+	// Version is the application version.
+	Version = "dev"
+	// BuildTime is the UTC release build timestamp.
+	BuildTime = ""
+)