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_acme_account.go

@@ -0,0 +1,82 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+package model
+
+import (
+	"context"
+	"errors"
+	"time"
+
+	"github.com/Rain-kl/Wavelet/internal/db"
+	"gorm.io/gorm"
+)
+
+// AcmeAccount OpenFlare ACME 账号实体。
+type AcmeAccount struct {
+	ID         uint      `json:"id" gorm:"primaryKey;autoIncrement"`
+	Email      string    `json:"email" gorm:"size:255"`
+	URL        string    `json:"url" gorm:"size:255"`
+	PrivateKey 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 (AcmeAccount) TableName() string {
+	return "of_acme_accounts"
+}
+
+// GetAcmeAccountByID 按 ID 查询 ACME 账号。
+func GetAcmeAccountByID(ctx context.Context, id uint) (*AcmeAccount, error) {
+	conn := db.DB(ctx)
+	if conn == nil {
+		return nil, errors.New(errDatabaseNotInitialized)
+	}
+	var account AcmeAccount
+	if err := conn.First(&account, id).Error; err != nil {
+		return nil, err
+	}
+	return &account, nil
+}
+
+// CreateAcmeAccountRecord 创建 ACME 账号。
+func CreateAcmeAccountRecord(ctx context.Context, account *AcmeAccount) error {
+	conn := db.DB(ctx)
+	if conn == nil {
+		return errors.New(errDatabaseNotInitialized)
+	}
+	return conn.Create(account).Error
+}
+
+// SaveAcmeAccount 保存 ACME 账号。
+func SaveAcmeAccount(ctx context.Context, account *AcmeAccount) error {
+	conn := db.DB(ctx)
+	if conn == nil {
+		return errors.New(errDatabaseNotInitialized)
+	}
+	return conn.Save(account).Error
+}
+
+// GetDefaultAcmeAccount 获取默认 ACME 账号，不存在时创建占位记录。
+func GetDefaultAcmeAccount(ctx context.Context) (*AcmeAccount, error) {
+	conn := db.DB(ctx)
+	if conn == nil {
+		return nil, errors.New(errDatabaseNotInitialized)
+	}
+	var account AcmeAccount
+	err := conn.Order("id asc").First(&account).Error
+	if err == nil {
+		return &account, nil
+	}
+	if !errors.Is(err, gorm.ErrRecordNotFound) {
+		return nil, err
+	}
+	account = AcmeAccount{
+		Email: "admin@openflare.dev",
+	}
+	if err = conn.Create(&account).Error; err != nil {
+		return nil, err
+	}
+	return &account, nil
+}