refactor: 调整项目结构为单向依赖

backend/internal/service/proxy.go

@@ -0,0 +1,35 @@
+package service
+
+import (
+	"fmt"
+	"time"
+)
+
+type Proxy struct {
+	ID        int64
+	Name      string
+	Protocol  string
+	Host      string
+	Port      int
+	Username  string
+	Password  string
+	Status    string
+	CreatedAt time.Time
+	UpdatedAt time.Time
+}
+
+func (p *Proxy) IsActive() bool {
+	return p.Status == StatusActive
+}
+
+func (p *Proxy) URL() string {
+	if p.Username != "" && p.Password != "" {
+		return fmt.Sprintf("%s://%s:%s@%s:%d", p.Protocol, p.Username, p.Password, p.Host, p.Port)
+	}
+	return fmt.Sprintf("%s://%s:%d", p.Protocol, p.Host, p.Port)
+}
+
+type ProxyWithAccountCount struct {
+	Proxy
+	AccountCount int64
+}