feat(watchdog): add exception handling and webhook integration

- Implement exception handling in TCP client to process error messages
- Add webhook functionality to send notifications for exceptions
- Introduce utility functions for string parsing
- Update config with webhook template

utils/handlers.go

@@ -6,6 +6,7 @@ import (
 	"net/http"
 	"strconv"
 	"time"
+	"strings"
 
 	"super-frpc/database"
 	"super-frpc/global"
@@ -128,3 +129,35 @@ func LogRequest(r *http.Request, userID int) {
 func IntToString(i int) string {
 	return strconv.Itoa(i)
 }
+
+func GetTextMiddle(text, left, right string) string {
+	start := 0
+	if left != "" {
+		idx := strings.Index(text, left)
+		if idx == -1 {
+			return ""
+		}
+		start = idx + len(left)
+	}
+
+	if right == "" {
+		if start > len(text) {
+			return ""
+		}
+		return text[start:]
+	}
+
+	endIdx := strings.Index(text[start:], right)
+	if endIdx == -1 {
+		return ""
+	}
+	return text[start : start+endIdx]
+}
+
+func GetCmdType(source string) string {
+	return GetTextMiddle(source, "[", "]")
+}
+
+func GetCmdParams(source string, param string) string {
+	return GetTextMiddle(source, "<"+param+">", "</"+param+">")
+}