fix(doubao): update file size type to int64

[xrgzs]

Fix: #8232 (comment)

[petercat-assistant]

Walkthrough

This pull request updates the data type for file size and timestamps in the Doubao driver from int to int64. This change ensures that larger file sizes and more precise timestamps can be handled, addressing potential overflow issues with the previous int type.

Changes

File	Summary
drivers/doubao/driver.go	Updated the handling of Size, Modified, and Ctime fields to use int64 directly without casting.
drivers/doubao/types.go	Changed the data types of Size, CreateTime, and UpdateTime from int to int64 to accommodate larger values.

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