feat: add curriculum management service and database integration for 26-week schedule generation

src/lib/db.js

@@ -29,6 +29,9 @@ export async function saveTopics(topics) {
       description: t.description,
       learning_relevance: t.learning_relevance || 'standard',
       relevance_locked: t.relevance_locked === true,
+      theme: t.theme || '',
+      complexity_weight: t.complexity_weight || 3,
+      difficulty: t.difficulty || 'intermediate',
     }, { requestKey: null });
   }
 }