Merge pull request #519 from bayma888/feature/group-sort-order

feat(admin): 新增-分组管理自由拖拽排序功能

backend/migrations/052_add_group_sort_order.sql

@@ -0,0 +1,8 @@
+-- Add sort_order field to groups table for custom ordering
+ALTER TABLE groups ADD COLUMN IF NOT EXISTS sort_order INT NOT NULL DEFAULT 0;
+
+-- Initialize existing groups with sort_order based on their ID
+UPDATE groups SET sort_order = id WHERE sort_order = 0;
+
+-- Create index for efficient sorting
+CREATE INDEX IF NOT EXISTS idx_groups_sort_order ON groups(sort_order);