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/postLog.go

@@ -0,0 +1,95 @@
+package postLog
+
+import (
+	"fmt"
+	"sync"
+	"time"
+)
+
+var (
+	loggerMutex sync.Mutex
+	isDebug     bool
+)
+
+const (
+	DEBUG = iota
+	INFO
+	WARNING
+	ERROR
+	FATAL
+)
+
+var levelNames = []string{"DEBUG", "INFO", "WARNING", "ERROR", "FATAL"}
+var levelColors = []int{34, 27, 220, 196, 124}
+
+func colorOut_256(s string, foreColor int) string {
+	return fmt.Sprintf("\033[38;5;%dm%s\033[m", foreColor, s)
+}
+
+func getSystemTime() string {
+	now := time.Now()
+	return now.Format("2006-01-02 15:04:05.000")
+}
+
+func SetDebugMode(debug bool) {
+	loggerMutex.Lock()
+	defer loggerMutex.Unlock()
+	isDebug = debug
+}
+
+func PostLog(message string, level int) {
+	timeNow := getSystemTime()
+
+	idx := level
+	if idx < 0 || idx >= len(levelNames) {
+		idx = INFO
+	}
+
+	loggerMutex.Lock()
+
+	if idx == DEBUG && !isDebug {
+		loggerMutex.Unlock()
+		return
+	}
+
+	levelDisplay := colorOut_256(levelNames[idx], levelColors[idx])
+	db := logsDB
+
+	loggerMutex.Unlock()
+
+	fmt.Printf("[%s - %s] %s\n", timeNow, levelDisplay, message)
+	insertLogToDB(db, level, message, timeNow)
+
+	if broadcaster != nil {
+		broadcaster.AddToHistory(LogMessage{
+			Level:     level,
+			Content:   message,
+			Timestamp: timeNow,
+		})
+		broadcaster.Broadcast(LogMessage{
+			Level:     level,
+			Content:   message,
+			Timestamp: timeNow,
+		})
+	}
+}
+
+func Debug(message string) {
+	PostLog(message, DEBUG)
+}
+
+func Info(message string) {
+	PostLog(message, INFO)
+}
+
+func Warning(message string) {
+	PostLog(message, WARNING)
+}
+
+func Error(message string) {
+	PostLog(message, ERROR)
+}
+
+func Fatal(message string) {
+	PostLog(message, FATAL)
+}