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/model/openflare_dns_account.go

@@ -0,0 +1,80 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+package model
+
+import (
+	"context"
+	"errors"
+	"time"
+
+	"github.com/Rain-kl/Wavelet/internal/db"
+)
+
+// DNSAccount OpenFlare DNS 账号实体。
+type DNSAccount struct {
+	ID            uint      `json:"id" gorm:"primaryKey;autoIncrement"`
+	Name          string    `json:"name" gorm:"size:255;not null"`
+	Type          string    `json:"type" gorm:"size:64;not null"`
+	Authorization string    `json:"-" gorm:"type:text;not null"`
+	CreatedAt     time.Time `json:"created_at" gorm:"autoCreateTime"`
+	UpdatedAt     time.Time `json:"updated_at" gorm:"autoUpdateTime"`
+}
+
+// TableName 表名。
+func (DNSAccount) TableName() string {
+	return "of_dns_accounts"
+}
+
+// ListDNSAccounts 列出全部 DNS 账号（授权信息不通过 JSON 暴露）。
+func ListDNSAccounts(ctx context.Context) ([]DNSAccount, error) {
+	conn := db.DB(ctx)
+	if conn == nil {
+		return nil, errors.New(errDatabaseNotInitialized)
+	}
+	var accounts []DNSAccount
+	if err := conn.Order("id desc").Find(&accounts).Error; err != nil {
+		return nil, err
+	}
+	return accounts, nil
+}
+
+// GetDNSAccountByID 按 ID 查询 DNS 账号。
+func GetDNSAccountByID(ctx context.Context, id uint) (*DNSAccount, error) {
+	conn := db.DB(ctx)
+	if conn == nil {
+		return nil, errors.New(errDatabaseNotInitialized)
+	}
+	var account DNSAccount
+	if err := conn.First(&account, id).Error; err != nil {
+		return nil, err
+	}
+	return &account, nil
+}
+
+// CreateDNSAccountRecord 创建 DNS 账号。
+func CreateDNSAccountRecord(ctx context.Context, account *DNSAccount) error {
+	conn := db.DB(ctx)
+	if conn == nil {
+		return errors.New(errDatabaseNotInitialized)
+	}
+	return conn.Create(account).Error
+}
+
+// SaveDNSAccount 保存 DNS 账号。
+func SaveDNSAccount(ctx context.Context, account *DNSAccount) error {
+	conn := db.DB(ctx)
+	if conn == nil {
+		return errors.New(errDatabaseNotInitialized)
+	}
+	return conn.Save(account).Error
+}
+
+// DeleteDNSAccountRecord 删除 DNS 账号。
+func DeleteDNSAccountRecord(ctx context.Context, id uint) error {
+	conn := db.DB(ctx)
+	if conn == nil {
+		return errors.New(errDatabaseNotInitialized)
+	}
+	return conn.Delete(&DNSAccount{}, id).Error
+}