fix(auto_repair): playbook_seed_service — 從 alert_rules.yaml 初始化 APPROVED Playbook

根本原因: playbooks 表空 → NO_MATCH → 永遠走審批，從不自動修復
修復: startup 時從 alert_rules.yaml seed APPROVED Playbook（冪等）
確保自動修復鏈路有規則可用

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/api/src/main.py

@@ -286,6 +286,15 @@ async def lifespan(_app: FastAPI) -> AsyncGenerator[None, None]:
     # 2026-04-10 Claude Sonnet 4.6 Asia/Taipei
     # 目的: 確保 playbook_embeddings 表有最新向量，供語義相似度查詢
     # 使用 asyncio.create_task 非阻塞 — 不影響 API 啟動速度
+    # Phase ADR-068 2026-04-10: 從 alert_rules.yaml seed Playbook（冪等）
+    # 必須在 embedding indexing 之前，確保 playbook 表有資料
+    try:
+        from src.services.playbook_seed_service import seed_playbooks_from_rules
+        asyncio.create_task(seed_playbooks_from_rules())
+        logger.info("playbook_seed_scheduled")
+    except Exception as e:
+        logger.warning("playbook_seed_schedule_failed", error=str(e))
+
     try:
         from src.services.playbook_embedding_service import ensure_playbook_embeddings_indexed
         asyncio.create_task(ensure_playbook_embeddings_indexed())