feat: complete Loki query, insights, settings and deployment workflows

Add the Loki query UI, access policies, ingress insights, alert and registry settings, and their backend APIs. Include the related Kubernetes deployment and collector updates required by the integrated application.

Validated with go test ./..., npm run build, and npm run lint.

backend/services/host.go

@@ -120,6 +120,33 @@ func (s *HostService) Update(id uint, updates map[string]interface{}) error {
 			if v, ok := updates["arch"].(string); ok {
 				db.Hosts[i].Arch = v
 			}
+			if v, ok := updates["hostIP"].(string); ok && v != "" {
+				db.Hosts[i].HostIP = v
+			}
+			if v, ok := updates["port"].(float64); ok && v > 0 {
+				db.Hosts[i].Port = int(v)
+			}
+			if v, ok := updates["user"].(string); ok && v != "" {
+				db.Hosts[i].User = v
+			}
+			if v, ok := updates["labels"].(string); ok {
+				db.Hosts[i].Labels = v
+			}
+			// 凭证编辑约定:非空才更新(留空=保留旧密文)
+			for _, field := range []string{"password", "privateKey", "keyPhrase"} {
+				if v, ok := updates[field].(string); ok && v != "" {
+					if enc, err := crypto.EncryptField(v); err == nil {
+						switch field {
+						case "password":
+							db.Hosts[i].Password = enc
+						case "privateKey":
+							db.Hosts[i].PrivateKey = enc
+						case "keyPhrase":
+							db.Hosts[i].KeyPhrase = enc
+						}
+					}
+				}
+			}
 			db.Hosts[i].UpdatedAt = time.Now()
 			db.RequestSave()
 			return nil