Create dataset mediapart

- uid: mediapart
- type: primary
- description:
- name: Mediapart
- description: French independent journal
- homepage: https://www.mediapart.fr/
- validated: True
- languages:
- language_names:
- French
- language_comments:
- language_locations:
- Western Europe
- France
- validated: False
- custodian:
- name: Mediapart
- in_catalogue:
- type: A commercial entity
- location: France
- contact_name: Mediapart
- contact_email: contact@mediapart.fr
- contact_submitter: False
- additional:
- validated: False
- availability:
- procurement:
- for_download: Yes - after signing a user agreement
- download_url:
- download_email:
- licensing:
- has_licenses: Yes
- license_text:
- license_properties:
- license_list:
- pii:
- has_pii: Yes
- generic_pii_likely:
- generic_pii_list:
- numeric_pii_likely:
- numeric_pii_list:
- sensitive_pii_likely:
- sensitive_pii_list:
- no_pii_justification_class:
- no_pii_justification_text:
- validated: False
- source_category:
- category_type: website
- category_web: news or magazine website
- category_media:
- validated: False
- media:
- category:
- text
- text_format:
- HTML
- audiovisual_format:
- image_format:
- text_is_transcribed: No
- instance_type: article
- instance_count:
- instance_size:
- validated: False
- fname: mediapart.json

使用 issue 中提供的数据集元数据创建 mediapart.json，并保留其字段和值。首先检查附近的数据集条目，以确认预期的 JSON 结构和格式；当新文件存在且符合 repository 的数据集条目约定时，即视为完成。

由索引模型根据 Issue 内容生成。