Introduce dedicated APIs for submodule lesson detail/update and subcategory listing (including Human Language), with SQL/query wiring and handler routing updates.
Made-with: Cursor
Expose APIs to list lessons by submodule and fetch a single lesson by ID, including title, description, intro video URL, and question count.
Made-with: Cursor
Replace rename-based lesson migration with additive sub_module_lessons creation, preserve sub_module_practices as its own model, and enforce QUIZ/PRACTICE filtering in hierarchy reads to prevent cross-mixing.
Made-with: Cursor
