用户管理增加余额调账功能

支持后台加减可用余额并写入资金流水与审计，优化操作列按钮样式。

backend/internal/modules/adminuser/handler.go

@@ -163,6 +163,29 @@ func (h *Handler) ManualRealname(c *gin.Context) {
 	response.OK(c, item)
 }
 
+func (h *Handler) AdjustWallet(c *gin.Context) {
+	adminID, ok := currentAdminID(c)
+	if !ok {
+		response.Unauthorized(c, "缺少管理员上下文")
+		return
+	}
+	userID, ok := parseID(c)
+	if !ok {
+		return
+	}
+	var req WalletAdjustRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		response.BadRequest(c, "余额调整参数不正确")
+		return
+	}
+	item, err := h.service.AdjustWallet(c.Request.Context(), adminID, userID, req, auditMeta(c))
+	if err != nil {
+		writeAdminUserError(c, err)
+		return
+	}
+	response.OK(c, item)
+}
+
 func currentAdminID(c *gin.Context) (uint64, bool) {
 	value, ok := c.Get(middleware.ContextAdminID)
 	if !ok {
@@ -201,6 +224,14 @@ func writeAdminUserError(c *gin.Context, err error) {
 		response.Error(c, http.StatusConflict, "realname_already_verified", "该用户已完成实名认证，如需修改请先撤销实名")
 	case errors.Is(err, ErrRealnameNotRevocable):
 		response.Error(c, http.StatusConflict, "realname_not_revocable", "该用户当前没有可撤销的实名信息")
+	case errors.Is(err, ErrInvalidWalletDirection):
+		response.BadRequest(c, "调账方向不正确，仅支持加款(in)或扣款(out)")
+	case errors.Is(err, ErrInvalidWalletAmount):
+		response.BadRequest(c, "调账金额不正确，需大于 0 且不超过 10 万元")
+	case errors.Is(err, ErrInvalidWalletReason):
+		response.BadRequest(c, "请填写 2-200 字的调账原因")
+	case errors.Is(err, ErrInsufficientBalance):
+		response.Error(c, http.StatusConflict, "insufficient_balance", "用户可用余额不足，无法扣款")
 	case IsNotFound(err):
 		response.Error(c, http.StatusNotFound, "not_found", "用户不存在")
 	default: