Summary of Significant Accounting Policies - Schedule of Revenue Recognition (Details)	12 Months Ended
Dec. 31, 2025 CNY (¥)	Dec. 31, 2025 USD ($)	Dec. 31, 2024 CNY (¥)	Dec. 31, 2023 CNY (¥)
Disaggregation of Revenue [Line Items]
Revenue	¥ 600,775,492	$ 85,473,408	¥ 565,273,477	¥ 497,868,200
Point in time [Member]
Disaggregation of Revenue [Line Items]
Revenue	268,906,138	38,257,759	242,162,290	158,069,415
Over time [Member]
Disaggregation of Revenue [Line Items]
Revenue	¥ 331,869,354	$ 47,215,649	¥ 323,111,187	¥ 339,798,785

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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