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/repository/template.go

@@ -0,0 +1,59 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+package repository
+
+import (
+	"context"
+	"errors"
+
+	"github.com/Rain-kl/Wavelet/internal/db"
+	"github.com/Rain-kl/Wavelet/internal/model"
+	"gorm.io/gorm"
+)
+
+// ListTemplates returns all templates ordered by system flag and creation time.
+func ListTemplates(ctx context.Context) ([]model.Template, error) {
+	var templates []model.Template
+	if err := db.DB(ctx).Order("is_system DESC, created_at DESC").Find(&templates).Error; err != nil {
+		return nil, err
+	}
+	return templates, nil
+}
+
+// GetTemplateByKey loads a template by its key.
+func GetTemplateByKey(ctx context.Context, key string) (model.Template, error) {
+	var tmpl model.Template
+	if err := db.DB(ctx).Where("key = ?", key).First(&tmpl).Error; err != nil {
+		return model.Template{}, err
+	}
+	return tmpl, nil
+}
+
+// TemplateExistsByKey reports whether a template key is already taken.
+func TemplateExistsByKey(ctx context.Context, key string) (bool, error) {
+	var existing model.Template
+	err := db.DB(ctx).Where("key = ?", key).First(&existing).Error
+	if errors.Is(err, gorm.ErrRecordNotFound) {
+		return false, nil
+	}
+	if err != nil {
+		return false, err
+	}
+	return true, nil
+}
+
+// CreateTemplate persists a new template.
+func CreateTemplate(ctx context.Context, tmpl *model.Template) error {
+	return db.DB(ctx).Create(tmpl).Error
+}
+
+// SaveTemplate updates an existing template.
+func SaveTemplate(ctx context.Context, tmpl *model.Template) error {
+	return db.DB(ctx).Save(tmpl).Error
+}
+
+// DeleteTemplate removes a template record.
+func DeleteTemplate(ctx context.Context, tmpl *model.Template) error {
+	return db.DB(ctx).Delete(tmpl).Error
+}