add-problems 是做什麼的？
Use this skill when adding a competition's problems to the site database through the bulk-import draft pipeline — registering a brand-new competition in the taxonomy if it isn't there yet, authoring the draft folder (statements + solutions + images, one original language plus translations), and running the bulk-import CLI validate until it passes. Trigger phrases — "add a new competition", "import a competition's problems into the DB", "register a competition in the taxonomy", "create a bulk-import draft", "add a round/year of a competition". Do NOT use for editing handouts (use the handout-* skills). The skill ends at validate; apply runs only on the user's explicit say-so.