feat: big ahh commit

- agent+proto+backend: transfer service status
- agent: fix returning empty message on nonzero exit status
- backend: refactor collector+commander and handlers dependent on them: implement agent accounting via grpc stats handler

backend/internal/handlers/agents.go

@@ -1,6 +1,7 @@
 package handlers
 
 import (
+	"fmt"
 	"net/http"
 
 	"gitea.d3m0k1d.ru/d3m0k1d/HellreigN/backend/internal/grpcsrv/collector"
@@ -36,10 +37,14 @@ func (ag *AgentsGroup) List(c *gin.Context) {
 	agents := make([]AgentInfo, 0)
 
 	for _, agent := range ag.collector.Agents() {
+		services := make([]string, 0, len(agent.Services))
+		for _, s := range agent.Services {
+			services = append(services, fmt.Sprintf("%s:%s", s.Name, s.Status))
+		}
 		agents = append(agents, AgentInfo{
 			Token:       agent.ID,
 			Label:       agent.Label,
-			Services:    agent.Services,
+			Services:    services,
 			ConnectedAt: agent.ConnectedAt.Format("2006-01-02 15:04:05"),
 		})
 	}