chunyu 37cad3947d feat(C-06)：关注feed+课程聚合修复 ...

文章列表新增author_user_id/is_following与feed=following过滤；课程students_count改真实在学人数去重统计、新增total_minutes（不可解析不伪造）；author_name走sync_to_async防ASGI同步阻塞。

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..

management/commands

sync from local backup

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migrations

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tests

feat(C-06)：关注feed+课程聚合修复

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__init__.py

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admin.py

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apps.py

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models.py

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serializers.py

feat(C-06)：关注feed+课程聚合修复

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urls.py

sync from local backup

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views.py

feat(C-06)：关注feed+课程聚合修复

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