feat: add niuzi bank commands

src/main/kotlin/cn/rtast/fancybot/entity/db/NiuziBankTable.kt

@@ -0,0 +1,26 @@
+/*
+ * Copyright © 2024 RTAkland
+ * Author: RTAkland
+ * Date: 2024/9/24
+ */
+
+
+package cn.rtast.fancybot.entity.db
+
+import org.jetbrains.exposed.sql.Table
+
+object NiuziBankTable: Table("niuzi_bank") {
+    val id = long("id").autoIncrement()
+    val userId = long("userId").uniqueIndex()
+    val timestamp = long("timestamp")
+    val balance = double("balance")
+    val interestRate = double("interest_rate")
+    override val primaryKey = PrimaryKey(id)
+}
+
+data class NiuziBankAccount(
+    val userId: Long,
+    val balance: Double,
+    val interestRate: Double,
+    val timestamp: Long
+)