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Accounts Receivable, Net - Schedule of Accounts Receivable, Net (Details) | Jun. 30, 2025 CNY (¥) | Jun. 30, 2025 USD ($) | Dec. 31, 2024 CNY (¥) | Dec. 31, 2023 CNY (¥)
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Schedule of Accounts Receivable Net [Abstract] |  |  |  |
Accounts receivable | ¥ 41,981,306 |  | ¥ 74,886,095 |
Allowance for credit losses | (38,308,560) |  | (38,352,201) | ¥ (37,610,720)
Accounts receivable, net | ¥ 3,672,746 | $ 512,695 | ¥ 36,533,894 |

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