feat: implement VPN platform management and real protocol services

backend/internal/monitor/monitor.go

@@ -0,0 +1,74 @@
+// Package monitor 周期性采集各专线运行状态与流量
+package monitor
+
+import (
+	"time"
+
+	"vpn-platform/backend/internal/core"
+	"vpn-platform/backend/internal/model"
+	"vpn-platform/backend/internal/store"
+)
+
+// Start 启动状态采集循环（每 15 秒刷新一次）
+func Start(mgr *core.Manager, interval time.Duration) {
+	if interval == 0 {
+		interval = 15 * time.Second
+	}
+	ticker := time.NewTicker(interval)
+	go func() {
+		collect(mgr) // 启动即采集一次
+		for range ticker.C {
+			collect(mgr)
+		}
+	}()
+}
+
+func collect(mgr *core.Manager) {
+	var tunnels []model.Tunnel
+	if err := store.DB.Find(&tunnels).Error; err != nil {
+		return
+	}
+	for i := range tunnels {
+		t := &tunnels[i]
+		p, err := mgr.Get(t.Protocol)
+		if err != nil {
+			continue
+		}
+		st, err := p.Status(t)
+		if err != nil {
+			continue
+		}
+		mgr.SetStatus(t.ID, st)
+		// 数据库状态与协议真实状态同步，避免页面长期展示过时的“运行中”。
+		if st.State != "" && st.State != t.State {
+			store.DB.Model(t).Update("state", st.State)
+		}
+		// 流量持久化（仅在有增量时写库）
+		if st.RxBytes > 0 || st.TxBytes > 0 {
+			store.DB.Model(t).Updates(map[string]interface{}{"rx_bytes": st.RxBytes, "tx_bytes": st.TxBytes})
+		}
+		// 到期自动停止
+		if t.ExpireAt != nil && time.Now().After(*t.ExpireAt) && t.State == "running" {
+			_ = p.Stop(t)
+			store.DB.Model(t).Update("state", "stopped")
+		}
+	}
+}
+
+// AutoStartAll 启动时拉起所有标记为自启的专线
+func AutoStartAll(mgr *core.Manager) {
+	var tunnels []model.Tunnel
+	if err := store.DB.Where("auto_start = ?", true).Find(&tunnels).Error; err != nil {
+		return
+	}
+	for i := range tunnels {
+		t := &tunnels[i]
+		if p, err := mgr.Get(t.Protocol); err == nil {
+			if err := p.Start(t); err != nil {
+				store.DB.Model(t).Updates(map[string]interface{}{"state": "error", "last_error": err.Error()})
+			} else {
+				store.DB.Model(t).Update("state", "running")
+			}
+		}
+	}
+}