feat(ai): AiWorker — notebook_match 매치 시 자동 moveNote

- NotebookRepository.findByName(name) 추가 — COLLATE NOCASE case-insensitive 조회
- AiWorkerOptions.notebookRepo 옵션 추가 (optional Pick<NotebookRepository, ...>)
- processJob: generate 전 notebookRepo.list() → notebooks 배열 GenerateInput 에 주입
- processJob: updateAiResult 후 res.notebookMatch valid 이름이면 findByName + moveNote 호출
- main/index.ts: AiWorker 생성 시 notebookRepo 전달
- NotebookRepository.test.ts: findByName 3개 테스트 추가
- AiWorker.test.ts: notebook 매칭 describe 4개 테스트 추가 (총 45 테스트 통과)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/main/repository/NotebookRepository.ts

@@ -60,6 +60,17 @@ export class NotebookRepository {
     }
   }
 
+  /** name 으로 notebook 조회 (COLLATE NOCASE — case-insensitive). */
+  findByName(name: string): Notebook | null {
+    const r = this.db.prepare(
+      `SELECT nb.id, nb.name, nb.color, nb.created_at, nb.updated_at,
+              (SELECT COUNT(*) FROM notes n
+                WHERE n.notebook_id = nb.id AND n.status = 'active') AS note_count
+         FROM notebooks nb WHERE nb.name = ? COLLATE NOCASE`
+    ).get(name) as Record<string, unknown> | undefined;
+    return r ? this.hydrate(r) : null;
+  }
+
   /** notes.notebook_id 갱신만 (status 등은 보존). */
   moveNote(noteId: string, notebookId: string): void {
     this.db.prepare(`UPDATE notes SET notebook_id=?, updated_at=? WHERE id=?`)