feat: add initial project structure with logging and watchdog service

Implement basic watchdog service for Linux systemd with:
- Configuration loading
- Logging system with database support
- WebSocket log broadcasting
- TCP server for agent communication
- Project setup with Go modules

postLog/logSocketHandler.go

@@ -0,0 +1,66 @@
+package postLog
+
+import (
+	"encoding/json"
+	"log"
+	"net/http"
+	"time"
+
+	"github.com/gorilla/websocket"
+)
+
+var upgrader = websocket.Upgrader{
+	ReadBufferSize:  1024,
+	WriteBufferSize: 1024,
+	CheckOrigin: func(r *http.Request) bool {
+		return true
+	},
+}
+
+type LogSocketHandler struct {
+	broadcaster *LogBroadcaster
+}
+
+func NewLogSocketHandler(b *LogBroadcaster) *LogSocketHandler {
+	return &LogSocketHandler{
+		broadcaster: b,
+	}
+}
+
+func (h *LogSocketHandler) Handle(w http.ResponseWriter, r *http.Request) {
+	conn, err := upgrader.Upgrade(w, r, nil)
+	if err != nil {
+		log.Printf("Failed to upgrade connection: %v", err)
+		return
+	}
+	defer conn.Close()
+
+	clientID := conn.RemoteAddr().String() + "-" + time.Now().Format("20060102150405")
+	clientCh := h.broadcaster.AddClient(clientID)
+	defer h.broadcaster.RemoveClient(clientID)
+
+	h.broadcaster.SendHistory(clientCh)
+
+	done := make(chan struct{})
+	go func() {
+		defer close(done)
+		for {
+			msg := <-clientCh
+			data, err := json.Marshal(msg)
+			if err != nil {
+				log.Printf("Failed to marshal log message: %v", err)
+				return
+			}
+			if err := conn.WriteMessage(websocket.TextMessage, data); err != nil {
+				return
+			}
+		}
+	}()
+
+	for {
+		_, _, err := conn.ReadMessage()
+		if err != nil {
+			return
+		}
+	}
+}