- Added scanSkillsDir() function that scans both three-level
(skills/<category>/<skill>/SKILL.md) and two-level
(skills/<skill>/SKILL.md) directory structures.
- Flat skills (at two-level) are grouped under a new 'misc'
(雜項) category, displayed with Chinese name '雜項'.
- Updated listFiles() and readFile_() to handle 'misc' category
path mapping correctly.
- All tests pass (347 passed, 3 pre-existing failures unrelated
to this change).
