add legacy category courses GET endpoint for compatibility

Expose GET /course-management/categories/:categoryId/courses so legacy tab/API callers no longer fail with Cannot GET during initial content load.

Made-with: Cursor

internal/web_server/handlers/hierarchy_handler.go

@@ -188,6 +188,56 @@ func (h *Handler) ListCourseCategories(c *fiber.Ctx) error {
 	})
 }
 
+// ListCoursesByCategory godoc
+// @Summary List courses by category
+// @Description Legacy-compatible endpoint that returns courses for one category
+// @Tags course-management
+// @Produce json
+// @Param categoryId path int true "Category ID"
+// @Param offset query int false "Offset"
+// @Param limit query int false "Limit"
+// @Success 200 {object} domain.Response
+// @Failure 400 {object} domain.ErrorResponse
+// @Failure 500 {object} domain.ErrorResponse
+// @Router /api/v1/course-management/categories/{categoryId}/courses [get]
+func (h *Handler) ListCoursesByCategory(c *fiber.Ctx) error {
+	categoryID, err := strconv.ParseInt(c.Params("categoryId"), 10, 64)
+	if err != nil || categoryID <= 0 {
+		return c.Status(fiber.StatusBadRequest).JSON(domain.ErrorResponse{Message: "Invalid category ID", Error: "categoryId must be a positive integer"})
+	}
+
+	offset := int32(c.QueryInt("offset", 0))
+	if offset < 0 {
+		offset = 0
+	}
+	limit := int32(c.QueryInt("limit", 10000))
+	if limit <= 0 {
+		limit = 10000
+	}
+
+	rows, err := h.analyticsDB.GetCoursesByCategory(c.Context(), dbgen.GetCoursesByCategoryParams{
+		CategoryID: categoryID,
+		Offset:     pgtype.Int4{Int32: offset, Valid: true},
+		Limit:      pgtype.Int4{Int32: limit, Valid: true},
+	})
+	if err != nil {
+		return c.Status(fiber.StatusInternalServerError).JSON(domain.ErrorResponse{Message: "Failed to load courses", Error: err.Error()})
+	}
+
+	total := 0
+	if len(rows) > 0 {
+		total = int(rows[0].TotalCount)
+	}
+
+	return c.JSON(domain.Response{
+		Message: "Courses retrieved successfully",
+		Data: map[string]interface{}{
+			"courses":     rows,
+			"total_count": total,
+		},
+	})
+}
+
 // CreateCourseCategory godoc
 // @Summary Create course category
 // @Description Legacy-compatible endpoint for creating a course category

internal/web_server/routes.go

@@ -80,6 +80,7 @@ func (a *App) initAppRoutes() {
 
 	// Unified Course Management (single hierarchy model)
 	groupV1.Get("/course-management/categories", a.authMiddleware, a.RequirePermission("learning_tree.get"), h.ListCourseCategories)
+	groupV1.Get("/course-management/categories/:categoryId/courses", a.authMiddleware, a.RequirePermission("learning_tree.get"), h.ListCoursesByCategory)
 	groupV1.Post("/course-management/categories", a.authMiddleware, a.RequirePermission("course_categories.create"), h.CreateCourseCategory)
 	groupV1.Delete("/course-management/categories/:categoryId", a.authMiddleware, a.RequirePermission("course_categories.delete"), h.DeleteCourseCategory)
 	groupV1.Post("/course-management/courses", a.authMiddleware, a.RequirePermission("courses.create"), h.CreateCourse)