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/openflare/config_version/renderer.go

@@ -0,0 +1,53 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+package config_version
+
+import (
+	openrestyrender "github.com/Rain-kl/Wavelet/pkg/render/openresty"
+)
+
+// SupportFile is a rendered configuration support artifact.
+type SupportFile struct {
+	Path    string `json:"path"`
+	Content string `json:"content"`
+}
+
+func renderSnapshotConfig(sourceJSON string, certificateFiles []SupportFile) (*openrestyrender.Result, error) {
+	return openrestyrender.RenderJSON(sourceJSON, toOpenRestySupportFiles(certificateFiles))
+}
+
+func toOpenRestySupportFiles(files []SupportFile) []openrestyrender.SupportFile {
+	if len(files) == 0 {
+		return nil
+	}
+	result := make([]openrestyrender.SupportFile, 0, len(files))
+	for _, file := range files {
+		result = append(result, openrestyrender.SupportFile{
+			Path:    file.Path,
+			Content: file.Content,
+		})
+	}
+	return result
+}
+
+func fromOpenRestySupportFiles(files []openrestyrender.SupportFile) []SupportFile {
+	if len(files) == 0 {
+		return nil
+	}
+	result := make([]SupportFile, 0, len(files))
+	for _, file := range files {
+		result = append(result, SupportFile{
+			Path:    file.Path,
+			Content: file.Content,
+		})
+	}
+	return result
+}
+
+func renderPlaceholderConfig(snapshotJSON string) (mainConfig, routeConfig, checksum string) {
+	mainConfig = `{"placeholder":"main_config"}`
+	routeConfig = snapshotJSON
+	checksum = openrestyrender.ChecksumBundle(mainConfig, routeConfig, nil)
+	return mainConfig, routeConfig, checksum
+}