init: hgmj server initial commit

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

common/PromotionCodeUtil.go

@@ -0,0 +1,22 @@
+package common
+
+import "math/rand"
+
+/**
+ * 生成邀请码
+ */
+var (
+	//所有的字符
+	allChars = []string{"2", "3", "4", "5", "6", "7", "8", "9", "A", "B", "C", "D", "E", "F", "G", "H", "J", "K", "L", "M", "N", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z"}
+	//默认长度
+	defaultLen = 6
+)
+
+func InvitePromotionCodeGenera() string {
+	result := ""
+	for i := 0; i < defaultLen; i++ {
+		index := rand.Intn(len(allChars))
+		result += allChars[index]
+	}
+	return result
+}