init: hgmj server initial commit

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

models/v/currencymod/base.go

@@ -0,0 +1,15 @@
+package currencymod
+
+import (
+	"91jd-server/common/db"
+	"91jd-server/models"
+)
+
+const currencyTable = models.Currency
+
+var currencyDB *db.MongoDB
+
+func Init() {
+	currencyDB = db.Init(currencyTable)
+	currencyIndex()
+}