feat(memoir): 回忆录分段两阶段管线（Phase1 分类 / Phase2 叙事）与配置、测试

api/app/tasks/__init__.py

@@ -4,12 +4,18 @@ Celery 任务模块
 
 from .celery_app import celery_app
 from .chapter_cover_tasks import generate_chapter_cover
-from .memoir_tasks import process_memoir_segments
+from .memoir_tasks import (
+    process_memoir_phase1,
+    process_memoir_phase2,
+    process_memoir_segments,
+)
 from .memory_compaction_tasks import memory_compaction_run
 from .story_image_tasks import generate_story_image
 
 __all__ = [
     "celery_app",
+    "process_memoir_phase1",
+    "process_memoir_phase2",
     "process_memoir_segments",
     "generate_chapter_cover",
     "generate_story_image",