Enhance hierarchy parsing to group Module-N and Module-N.M naming into stable module/sub-module structures under each CEFR level for consistent rendering.
Made-with: Cursor
Expose a dedicated human-language hierarchy endpoint aligned to category/subcategory/course/level/module/sub-module structure and add a complete learner mobile integration guide.
Made-with: Cursor
Introduce separate CEFR-based human language lesson APIs for create, update, and level-filtered retrieval while keeping existing non-language course hierarchy endpoints unchanged.
Made-with: Cursor
