init: 初始化 web_hgdjb_server 项目

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

pub/common/utils/num.go

@@ -0,0 +1,20 @@
+package utils
+
+import (
+	"math/rand"
+	"time"
+)
+
+// CountDigits 有几位数字
+func CountDigits(i int) (count int) {
+	for i != 0 {
+		i /= 10
+		count++
+	}
+	return
+}
+
+func RandInt(min int, max int) int {
+	rand.Seed(time.Now().UnixNano())
+	return min + rand.Intn(max-min)
+}