refactor: consolidate debug flag and update gitignore

- Rename debugMode to isDebug for consistency across codebase
- Move debug flag check in ValidateTimeStamp to match other validations
- Add database.db to gitignore and remove unused config file
- Update README.md to clarify user registration rules

main.go

@@ -12,20 +12,22 @@ import (
 )
 
 type SoftwareInfo struct {
-	Name string
-	Version string
-	Developer string
-	BuildVer int16
+	Name        string
+	Version     string
+	Developer   string
+	BuildVer    int16
 	Description string
-	BuildType string
+	BuildType   string
 }
 
+var isDebug bool
+
 func main() {
 	softwareInfo := SoftwareInfo{
-		Name: "Super-frpc",
-		Version: "0.0.1",
+		Name:      "Super-frpc",
+		Version:   "0.0.1",
 		Developer: "Madobi Nanami",
-		BuildVer: 1,
+		BuildVer:  1,
 		BuildType: "debug",
 	}
 	postLog.Info(fmt.Sprintf("%s %s (Build %d.%s) by %s", softwareInfo.Name, softwareInfo.Version, softwareInfo.BuildVer, softwareInfo.BuildType, softwareInfo.Developer))
@@ -52,6 +54,7 @@ func main() {
 
 	// Initialize logger with debug mode
 	postLog.SetDebugMode(config.Debug)
+	isDebug = config.Debug
 
 	if err := InitDatabase(*dbPath); err != nil {
 		postLog.Fatal(fmt.Sprintf("Failed to initialize database: %v", err))