feat: redesign collection UI + add StopHostAfterCollect + TCP ping pre-probe

- Single "Подключиться" button flow: probe first, then show collect options
- Power management checkboxes: power on before / stop after collect
- Modal confirmation when enabling shutdown on already-powered-on host
- StopHostAfterCollect flag: host shuts down only when explicitly requested
- TCP ping (10 attempts, min 3 successes) before Redfish probe
- Debug payloads checkbox (Oem/Ami/Inventory/Crc, off by default)
- Remove platform_config BIOS settings collection (unreliable on AMI)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

internal/server/collect_types.go

@@ -19,7 +19,9 @@ type CollectRequest struct {
 	Password         string `json:"password,omitempty"`
 	Token            string `json:"token,omitempty"`
 	TLSMode          string `json:"tls_mode"`
-	PowerOnIfHostOff bool   `json:"power_on_if_host_off,omitempty"`
+	PowerOnIfHostOff     bool `json:"power_on_if_host_off,omitempty"`
+	StopHostAfterCollect bool `json:"stop_host_after_collect,omitempty"`
+	DebugPayloads        bool `json:"debug_payloads,omitempty"`
 }
 
 type CollectProbeResponse struct {

internal/server/handlers.go

@@ -10,8 +10,10 @@ import (
 	"fmt"
 	"html/template"
 	"io"
+	"net"
 	"net/http"
 	"os"
+	"sync/atomic"
 	"path/filepath"
 	"regexp"
 	"sort"
@@ -1574,6 +1576,32 @@ func (s *Server) handleCollectStart(w http.ResponseWriter, r *http.Request) {
 	_ = json.NewEncoder(w).Encode(job.toJobResponse("Collection job accepted"))
 }
 
+// pingHost dials host:port up to total times with 2s timeout each, returns true if
+// at least need attempts succeeded.
+func pingHost(host string, port int, total, need int) (bool, string) {
+	addr := fmt.Sprintf("%s:%d", host, port)
+	var successes atomic.Int32
+	done := make(chan struct{}, total)
+	for i := 0; i < total; i++ {
+		go func() {
+			defer func() { done <- struct{}{} }()
+			conn, err := net.DialTimeout("tcp", addr, 2*time.Second)
+			if err == nil {
+				conn.Close()
+				successes.Add(1)
+			}
+		}()
+	}
+	for i := 0; i < total; i++ {
+		<-done
+	}
+	n := int(successes.Load())
+	if n < need {
+		return false, fmt.Sprintf("Хост недоступен: только %d из %d попыток подключения к %s прошли успешно (требуется минимум %d)", n, total, addr, need)
+	}
+	return true, ""
+}
+
 func (s *Server) handleCollectProbe(w http.ResponseWriter, r *http.Request) {
 	var req CollectRequest
 	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
@@ -1595,6 +1623,11 @@ func (s *Server) handleCollectProbe(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
+	if ok, msg := pingHost(req.Host, req.Port, 10, 3); !ok {
+		jsonError(w, msg, http.StatusBadRequest)
+		return
+	}
+
 	ctx, cancel := context.WithTimeout(r.Context(), 20*time.Second)
 	defer cancel()
 
@@ -1967,7 +2000,9 @@ func toCollectorRequest(req CollectRequest) collector.Request {
 		Password:         req.Password,
 		Token:            req.Token,
 		TLSMode:          req.TLSMode,
-		PowerOnIfHostOff: req.PowerOnIfHostOff,
+		PowerOnIfHostOff:     req.PowerOnIfHostOff,
+		StopHostAfterCollect: req.StopHostAfterCollect,
+		DebugPayloads:        req.DebugPayloads,
 	}
 }